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140 results on '"Vahlbruch, Henning"'

1. Detection of 15 dB Squeezed States of Light and their Application for the Absolute Calibration of Photoelectric Quantum Efficiency

Author

Vahlbruch, Henning, Mehmet, Moritz, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics, Physics - Optics
Abstract

Squeezed states of light belong to the most prominent nonclassical resources. They have compelling applications in metrology, which has been demonstrated by their routine exploitation for improving the sensitivity of a gravitational-wave detector since 2010. Here, we report on the direct measurement of 15 dB squeezed vacuum states of light and their application to calibrate the quantum efficiency of photoelectric detection. The object of calibration is a customized InGaAs positive intrinsic negative (p-i-n) photodiode optimized for high external quantum efficiency. The calibration yields a value of 99.5% with a 0.5% (k = 2) uncertainty for a photon flux of the order 10^17/s at a wavelength of 1064 nm. The calibration neither requires any standard nor knowledge of the incident light power and thus represents a valuable application of squeezed states of light in quantum metrology.

Published
2024
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2. Direct Limits on Stochastic Length Fluctuations at Radio Frequencies

Author

Patra, Abhinav, Aiello, Lorenzo, Ejlli, Aldo, Griffiths, William L., James, Alasdair L., Kuntimaddi, Nikitha, Kwon, Ohkyung, Schwartz, Eyal, Vahlbruch, Henning, Vermeulen, Sander M., Dooley, Katherine L., Kokeyama, Keiko, and Grote, Hartmut

Subjects
General Relativity and Quantum Cosmology
Abstract

The Quantum-Enhanced Space-Time (QUEST) experiment consists of a pair of co-located Power Recycled Michelson Interferometers, each designed to have a broadband, shot-noise limited displacement sensitivity of $2\times10^{-19}$ $\mathrm{m/\sqrt{Hz}}$ from 1 to 200 MHz. Here we present the first results of QUEST that set new upper limits on correlated length fluctuations from 13 to 80 MHz, constituting the first broadband constraints for a stochastic gravitational wave background at these frequencies. In a coincident observing run of $10^{4}$ s the averaging of the cross-correlation spectra between the two interferometer signals resulted in a strain sensitivity of $3\times10^{-20}$ $\mathrm{1/\sqrt{Hz}}$ at 40 MHz, making QUEST the most sensitive table-top interferometric system to date.

Published
2024

3. Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO 600

Author

Bergamin, Fabio, Lough, James, Schreiber, Emil, Grote, Hartmut, Mehmet, Moritz, Vahlbruch, Henning, Affeldt, Christoph, Andric, Tomislav, Bisht, Aparna, Bringmann, Marc, Kringel, Volker, Lück, Harald, Mukund, Nikhil, Nadji, Severin, Sorazu, Borja, Strain, Kenneth, Weinert, Michael, and Danzmann, Karsten

Subjects
Physics - Optics, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Squeezed light is injected into the dark port of gravitational wave interferometers, in order to reduce the quantum noise. A fraction of the interferometer output light can reach the OPO due to sub-optimal isolation of the squeezing injection path. This backscattered light interacts with squeezed light generation process, introducing additional measurement noise. We present a theoretical description of the noise coupling mechanism. We propose a control scheme to achieve a de-amplification of the backscattered light inside the OPO with a consequent reduction of the noise caused by it. The scheme was implemented at the GEO 600 detector and has proven to be crucial in maintaining a good level of quantum noise reduction of the interferometer for high parametric gain of the OPO. In particular, the mitigation of the backscattered light noise helped in reaching 6dB of quantum noise reduction [Phys. Rev. Lett. 126, 041102 (2021)]. The impact of backscattered-light-induced noise on the squeezing performance is phenomenologically equivalent to increased phase noise of the squeezing angle control. The results discussed in this paper provide a way for a more accurate estimation of the residual phase noise of the squeezed light field., Comment: 14 pages, 6 figures

Published
2023

4. Improving the stability of frequency dependent squeezing with bichromatic control of filter cavity length, alignment and incident beam pointing

Author

Zhao, Yuhang, Capocasa, Eleonora, Eisenmann, Marc, Aritomi, Naoki, Page, Michael, Guo, Yuefan, Polini, Eleonora, Arai, Koji, Aso, Yoichi, van Beuzekom, Martin, Huang, Yao-Chin, Lee, Ray-Kuang, Lück, Harald, Miyakawa, Osamu, Prat, Pierre, Shoda, Ayaka, Tacca, Matteo, Takahashi, Ryutaro, Vahlbruch, Henning, Vardaro, Marco, Wu, Chien-Ming, Leonardi, Matteo, Barsuglia, Matteo, and Flaminio, Raffaele

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Quantum Physics
Abstract

Frequency dependent squeezing is the main upgrade for achieving broadband quantum noise reduction in upcoming observation runs of gravitational wave detectors. The proper frequency dependence of the squeezed quadrature is obtained by reflecting squeezed vacuum from a Fabry-Perot filter cavity detuned by half of its linewidth. However, since the squeezed vacuum contains no classical amplitude, co-propagating auxiliary control beams are required to achieve the filter cavity's length, alignment, and incident beam pointing stability. In our frequency dependent squeezing experiment at the National Astronomical Observatory of Japan, we used a control beam at a harmonic of squeezed vacuum wavelength and found visible detuning variation related to the suspended mirrors angular drift. These variations can degrade interferometer quantum noise reduction. We investigated various mechanisms that can cause the filter cavity detuning variation. The detuning drift is found to be mitigated sufficiently by fixing the incident beam pointing and applying filter cavity automatic alignment. It was also found that there is an optimal position of the beam on the filter cavity mirror that helps to reduce the detuning fluctuations. Here we report a stabilized filter cavity detuning variation of less than 10$\,$Hz compared to the 113$\,$Hz cavity linewidth. Compared to previously published results [Phys. Rev. Lett. 124, 171101 (2020)], such detuning stability would be sufficient to make filter cavity detuning drift induced gravitational wave detector detection range fluctuation reduce from $11\%$ to within $2\%$., Comment: Accepted by PRD

Published
2022
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5. Direct limits for scalar field dark matter from a gravitational-wave detector

Author

Vermeulen, Sander M., Relton, Philip, Grote, Hartmut, Raymond, Vivien, Affeldt, Christoph, Bergamin, Fabio, Bisht, Aparna, Brinkmann, Marc, Danzmann, Karsten, Doravari, Suresh, Kringel, Volker, Lough, James, Lück, Harald, Mehmet, Moritz, Mukund, Nikhil, Nadji, Séverin, Schreiber, Emil, Sorazu, Borja, Strain, Kenneth A., Vahlbruch, Henning, Weinert, Michael, Willke, Benno, and Wittel, Holger

Subjects
General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology
Abstract

The nature of dark matter remains unknown to date; several candidate particles are being considered in a dynamically changing research landscape. Scalar field dark matter is a prominent option that is being explored with precision instruments, such as atomic clocks and optical cavities. Here we report on the first direct search for scalar field dark matter utilising a gravitational-wave detector, which operates beyond the quantum shot-noise limit. We set new upper limits for the coupling constants of scalar field dark matter as a function of its mass, by excluding the presence of signals that would be produced through the direct coupling of this dark matter to the beamsplitter of the GEO$\,$600 interferometer. The new constraints improve upon bounds from previous direct searches by more than six orders of magnitude, and are in some cases more stringent than limits obtained in tests of the equivalence principle by up to four orders of magnitude. Our work demonstrates that scalar field dark matter can be probed or constrained with direct searches using gravitational-wave detectors, and highlights the potential of quantum-enhanced interferometry for dark matter detection.

Published
2021
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6. Numerical analysis of LG33 second harmonic generation in comparison to the LG00 case

Author

Heinze, Joscha, Vahlbruch, Henning, and Willke, Benno

Subjects
Physics - Optics
Abstract

For coating Brownian thermal noise reduction in future gravitational wave detectors, it is proposed to use light in the helical Laguerre-Gaussian LG33 mode instead of the currently used LG00 mode. However, the simultaneous reduction of quantum noise would then require the efficient generation of squeezed vacuum states in the LG33 mode. Current squeezed light generation techniques employ continuous-wave second harmonic generation (SHG). Here, we simulate the SHG for both modes numerically to derive first insights into the transferability of standard squeezed light generation techniques to the LG33 mode. In the first part of this paper, we therefore theoretically discuss SHG in the case of a single undepleted pump mode, which, in general, excites a superposition of harmonic modes. Based on the differential equation for the harmonic field, we derive individual phase matching conditions and hence conversion efficiencies for the excited harmonic modes. In the second part, we analyse the numerical simulations of the LG00 and LG33 SHG in a single-pass, double-pass and cavity-enhanced configuration under the influence of the focusing, the different pump intensity distributions and the individual phase matching conditions. Our results predict that the LG33 mode requires about 14 times the pump power of the LG00 mode to achieve the same SHG conversion efficiency in an ideal, realistic cavity design and mainly generates the harmonic LG66 mode., Comment: 17 pages, 8 figures, 20 references

Published
2020
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7. First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory

Author

Lough, James, Schreiber, Emil, Bergamin, Fabio, Grote, Hartmut, Mehmet, Moritz, Vahlbruch, Henning, Affeldt, Christoph, Brinkmann, Marc, Bisht, Aparna, Kringel, Volker, Lück, Harald, Mukund, Nikhil, Nadji, Séverin, Sorazu, Borja, Strain, Kenneth, Weinert, Michael, and Danzmann, Karsten

Subjects
Physics - Instrumentation and Detectors
Abstract

Photon shot noise, arising from the quantum-mechanical nature of the light, currently limits the sensitivity of all the gravitational wave observatories at frequencies above one kilohertz. We report a successful application of squeezed vacuum states of light at the GEO\,600 observatory and demonstrate for the first time a reduction of quantum noise up to $6.03 \pm 0.02$ dB in a kilometer-scale interferometer. This is equivalent at high frequencies to increasing the laser power circulating in the interferometer by a factor of four. Achieving this milestone, a key goal for the upgrades of the advanced detectors, required a better understanding of the noise sources and losses, and implementation of robust control schemes to mitigate their contributions. In particular, we address the optical losses from beam propagation, phase noise from the squeezing ellipse, and backscattered light from the squeezed light source. The expertise gained from this work carried out at GEO 600 provides insight towards the implementation of 10 dB of squeezing envisioned for third-generation gravitational wave detectors.

Published
2020
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8. Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors

Author

Zhao, Yuhang, Aritomi, Naoki, Capocasa, Eleonora, Leonardi, Matteo, Eisenmann, Marc, Guo, Yuefan, Polini, Eleonora, Tomura, Akihiro, Arai, Koji, Aso, Yoichi, Huang, Yao-Chin, Lee, Ray-Kuang, Lück, Harald, Miyakawa, Osamu, Prat, Pierre, Shoda, Ayaka, Tacca, Matteo, Takahashi, Ryutaro, Vahlbruch, Henning, Vardaro, Marco, Wu, Chien-Ming, Barsuglia, Matteo, and Flaminio, Raffaele

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The astrophysical reach of current and future ground-based gravitational-wave detectors is mostly limited by quantum noise, induced by vacuum fluctuations entering the detector output port. The replacement of this ordinary vacuum field with a squeezed vacuum field has proven to be an effective strategy to mitigate such quantum noise and it is currently used in advanced detectors. However, current squeezing cannot improve the noise across the whole spectrum because of the Heisenberg uncertainty principle: when shot noise at high frequencies is reduced, radiation pressure at low frequencies is increased. A broadband quantum noise reduction is possible by using a more complex squeezing source, obtained by reflecting the squeezed vacuum off a Fabry-Perot cavity, known as filter cavity. Here we report the first demonstration of a frequency-dependent squeezed vacuum source able to reduce quantum noise of advanced gravitational-wave detectors in their whole observation bandwidth. The experiment uses a suspended 300-m-long filter cavity, similar to the one planned for KAGRA, Advanced Virgo and Advanced LIGO, and capable of inducing a rotation of the squeezing ellipse below 100 Hz.

Published
2020
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9. Continuous-wave squeezed states of light via 'up-down' self-phase modulation

Author

Singh, Amrit Pal, Ast, Stefan, Mehmet, Moritz, Vahlbruch, Henning, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Continuous-wave (cw) squeezed states of light have applications in sensing, metrology and secure communication. In recent decades their efficient generation has been based on parametric down-conversion, which requires pumping by externally generated pump light of twice the optical frequency. Currently, there is immense effort in miniaturizing squeezed-light sources for chip-integration. Designs that require just a single input wavelength are favored since they offer an easier realization. Here we report the first observation of cw squeezed states generated by self-phase modulation caused by subsequent up and down conversions. The wavelengths of input light and of balanced homodyne detection are identical, and 1550 nm in our case. At sideband frequencies around 1.075 GHz, a nonclassical noise reduction of (2.4 +/- 0.1) dB is observed. The setup uses a second-order nonlinear crystal, but no externally generated light of twice the frequency. Our experiment is not miniaturized, but might open a route towards simplified chip-integrated realizations.

Published
2019
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10. Alignment sensing and control for squeezed vacuum states of light

Author

Schreiber, Emil, Dooley, Kathrine L., Vahlbruch, Henning, Affeldt, Christoph, Bisht, Aparna, Leong, Jonathan R., Lough, James, Prijatelj, Mirko, Slutsky, Jacob, Was, Michal, Wittel, Holger, Danzmann, Karsten, and Grote, Hartmut

Subjects
Physics - Instrumentation and Detectors, Physics - Optics, Quantum Physics
Abstract

Beam alignment is an important practical aspect of the application of squeezed states of light. Misalignments in the detection of squeezed light result in a reduction of the observable squeezing level. In the case of squeezed vacuum fields that contain only very few photons, special measures must be taken in order to sense and control the alignment of the essentially dark beam. The GEO600 gravitational wave detector employs a squeezed vacuum source to improve its detection sensitivity beyond the limits set by classical quantum shot noise. Here, we present our design and implementation of an alignment sensing and control scheme that ensures continuous optimal alignment of the squeezed vacuum field at GEO 600 on long time scales in the presence of free-swinging optics. This first demonstration of a squeezed light automatic alignment system will be of particular interest for future long-term applications of squeezed vacuum states of light.

Published
2015
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11. Phase Control of Squeezed Vacuum States of Light in Gravitational Wave Detectors

Author

Dooley, Katherine L, Schreiber, Emil, Vahlbruch, Henning, Affeldt, Christoph, Leong, Jonathan R, Wittel, Holger, and Grote, Hartmut

Subjects
Physics - Instrumentation and Detectors, Physics - Optics
Abstract

Quantum noise will be the dominant noise source for the advanced laser interferometric gravitational wave detectors currently under construction. Squeezing-enhanced laser interferometers have been recently demonstrated as a viable technique to reduce quantum noise. We propose two new methods of generating an error signal for matching the longitudinal phase of squeezed vacuum states of light to the phase of the laser interferometer output field. Both provide a superior signal to the one used in previous demonstrations of squeezing applied to a gravitational-wave detector. We demonstrate that the new signals are less sensitive to misalignments and higher order modes, and result in an improved stability of the squeezing level. The new signals also offer the potential of reducing the overall rms phase noise and optical losses, each of which would contribute to achieving a higher level of squeezing. The new error signals are a pivotal development towards realizing the goal of 6 dB and more of squeezing in advanced detectors and beyond.

Published
2014
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12. Length sensing and control of a Michelson interferometer with Power Recycling and Twin Signal Recycling cavities

Author

Gräf, Christian, Thüring, André, Vahlbruch, Henning, Danzmann, Karsten, and Schnabel, Roman

Subjects
Physics - Optics, General Relativity and Quantum Cosmology, Quantum Physics
Abstract

The techniques of power recycling and signal recycling have proven as key concepts to increase the sensitivity of large-scale gravitational wave detectors by independent resonant enhancement of light power and signal sidebands within the interferometer. Developing the latter concept further, twin signal recycling was proposed as an alternative to conventional detuned signal recycling. Twin signal recycling features the narrow-band sensitivity gain of conventional detuned signal recycling but furthermore facilitates the injection of squeezed states of light, increases the detector sensitivity over a wide frequency band and requires a less complex detection scheme for optimal signal readout. These benefits come at the expense of an additional recycling mirror, thus increasing the number of degrees of freedom in the interferometer which need to be controlled. In this article we describe the development of a length sensing and control scheme and its successful application to a tabletop-scale power recycled Michelson interferometer with twin signal recycling. We were able to lock the interferometer in all relevant longitudinal degrees of freedom, enabling the long-term stable operation of the experiment. We thus laid the foundation for further investigations of this interferometer topology to evaluate its viability for the application in gravitational wave detectors., Comment: 11 pages, 5 figures

Published
2012
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13. Status of the GEO 600 squeezed-light laser

Author

Khalaidovski, Alexander, Vahlbruch, Henning, Lastzka, Nico, Graef, Christian, Lueck, Harald, Danzmann, Karsten, Grote, Hartmut, and Schnabel, Roman

Subjects
Quantum Physics, Physics - Optics
Abstract

In the course of the high-frequency upgrade of GEO 600, its optical configuration was extended by a squeezed-light laser [1]. Recently, a non-classically enhanced measurement sensitivity of GEO 600 was reported [2]. In this paper, a characterization of the squeezed-light laser is presented. Thereupon, the status of the integration into GEO 600 is reviewed, focussing on the sources of optical loss limiting the shot noise reduction by squeezing at the moment. Finally, the possibilities for a future loss reduction are discussed., Comment: Proceeding of the 9th Edoardo Amaldi Conference on Gravitational Waves

Published
2011
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14. Squeezed light at 1550 nm with a quantum noise reduction of 12.3 dB

Author

Mehmet, Moritz, Ast, Stefan, Eberle, Tobias, Steinlechner, Sebastian, Vahlbruch, Henning, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Continuous-wave squeezed states of light at the wavelength of 1550 nm have recently been demonstrated, but so far the obtained factors of noise suppression still lag behind today's best squeezing values demonstrated at 1064 nm. Here we report on the realization of a half-monolithic nonlinear resonator based on periodically-poled potassium titanyl phosphate which enabled the direct detection of up to 12.3 dB of squeezing at 5 MHz. Squeezing was observed down to a frequency of 2 kHz which is well within the detection band of gravitational wave interferometers. Our results suggest that a long-term stable 1550 nm squeezed light source can be realized with strong squeezing covering the entire detection band of a 3rd generation gravitational-wave detector such as the Einstein Telescope.

Published
2011
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15. Long-term stable squeezed vacuum state of light for gravitational wave detectors

Author

Khalaidovski, Alexander, Vahlbruch, Henning, Lastzka, Nico, Graef, Christian, Danzmann, Karsten, Grote, Hartmut, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Currently, the German/British gravitational wave detector GEO600 is being upgraded in course of the GEO-HF program. One part of this upgrade consists of the integration of a squeezed light laser to nonclassically improve the detection sensitivity at frequencies where the instrument is limited by shot noise. This has been achieved recently [1]. The permanent employment of squeezed light in gravitational wave observatories requires a long-term stability of the generated squeezed state. In this paper, we discuss an unwanted mechanism that can lead to a varying squeezing factor along with a changing phase of the squeezed field. We present an extension of the implemented coherent control scheme [2] that allowed an increase in the long-term stability of the GEO600 squeezed light laser. With it, a quantum noise reduction by more than 9 dB in the frequency band of 10 Hz - 10 kHz was observed over up to 20 hours with a duty cycle of more than 99%.

Published
2011
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16. Quantum Enhancement of the Zero-Area Sagnac Interferometer Topology for Gravitational Wave Detection

Author

Eberle, Tobias, Steinlechner, Sebastian, Bauchrowitz, Jöran, Händchen, Vitus, Vahlbruch, Henning, Mehmet, Moritz, Müller-Ebhardt, Helge, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Only a few years ago, it was realized that the zero-area Sagnac interferometer topology is able to perform quantum nondemolition measurements of position changes of a mechanical oscillator. Here, we experimentally show that such an interferometer can also be efficiently enhanced by squeezed light. We achieved a nonclassical sensitivity improvement of up to 8.2 dB, limited by optical loss inside our interferometer. Measurements performed directly on our squeezed-light laser output revealed squeezing of 12.7 dB. We show that the sensitivity of a squeezed-light enhanced Sagnac interferometer can surpass the standard quantum limit for a broad spectrum of signal frequencies without the need for filter cavities as required for Michelson interferometers. The Sagnac topology is therefore a powerful option for future gravitational-wave detectors, such as the Einstein Telescope, whose design is currently being studied., Comment: 4 pages, 4 figures

Published
2010
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17. Broadband squeezing of quantum noise in a Michelson interferometer with Twin-Signal-Recycling

Author

Thüring, André, Gräf, Christian, Vahlbruch, Henning, Mehmet, Moritz, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Twin-Signal-Recycling (TSR) builds on the resonance doublet of two optically coupled cavities and efficiently enhances the sensitivity of an interferometer at a dedicated signal frequency. We report on the first experimental realization of a Twin-Signal-Recycling Michelson interferometer and also its broadband enhancement by squeezed light injection. The complete setup was stably locked and a broadband quantum noise reduction of the interferometers shot noise by a factor of up to 4\,dB was demonstrated. The system was characterized by measuring its quantum noise spectra for several tunings of the TSR cavities. We found good agreement between the experimental results and numerical simulations.

Published
2010
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18. The GEO600 squeezed light source

Author

Vahlbruch, Henning, Khalaidovski, Alexander, Lastzka, Nico, Graef, Christian, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

The next upgrade of the GEO600 gravitational wave detector is scheduled for 2010 and will, in particular, involve the implementation of squeezed light. The required non-classical light source is assembled on a 1.5m^2 breadboard and includes a full coherent control system and a diagnostic balanced homodyne detector. Here, we present the first experimental characterization of this setup as well as a detailed description of its optical layout. A squeezed quantum noise of up to 9dB below the shot-noise level was observed in the detection band between 10Hz and 10kHz. We also present an analysis of the optical loss in our experiment and provide an estimation of the possible non-classical sensitivity improvement of the future squeezed light enhanced GEO600 detector., Comment: 8 pages, 4 figures

Published
2010
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19. Observation of squeezed states with strong photon number oscillations

Author

Mehmet, Moritz, Vahlbruch, Henning, Lastzka, Nico, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Squeezed states of light constitute an important nonclassical resource in the field of high-precision measurements, e.g. gravitational wave detection, as well as in the field of quantum information, e.g. for teleportation, quantum cryptography, and distribution of entanglement in quantum computation networks. Strong squeezing in combination with high purity, high bandwidth and high spatial mode quality is desirable in order to achieve significantly improved performances contrasting any classical protocols. Here we report on the observation of the strongest squeezing to date of 11.5 dB, together with unprecedented high state purity corresponding to a vacuum contribution of less than 5%, and a squeezing bandwidth of about 170 MHz. The analysis of our squeezed states reveals a significant production of higher-order pairs of quantum-correlated photons, and the existence of strong photon number oscillations., Comment: 7 pages, 6 figures

Published
2009
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20. Observation of continuous-wave squeezed light at 1550 nm

Author

Mehmet, Moritz, Steinlechner, Sebastian, Eberle, Tobias, Vahlbruch, Henning, Thüring, André, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We report on the generation of continuous-wave squeezed vacuum states of light at the telecommunication wavelength of 1550 nm. The squeezed vacuum states were produced by type I optical parametric amplification (OPA) in a standing-wave cavity built around a periodically poled potassium titanyl phosphate (PPKTP) crystal. A non-classical noise reduction of 5.3 dB below the shot noise was observed by means of balanced homodyne detection., Comment: 4 pages, 3 figures

Published
2009
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21. Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO600

Author

Bergamin, Fabio, primary, Lough, James, additional, Schreiber, Emil, additional, Grote, Hartmut, additional, Mehmet, Moritz, additional, Vahlbruch, Henning, additional, Affeldt, Christoph, additional, Andric, Tomislav, additional, Bisht, Aparna, additional, Brinkmann, Marc, additional, Kringel, Volker, additional, Lueck, Harald, additional, Mukund, Nikhil, additional, NADJI, Severin Landry, additional, Sorazu, Borja, additional, Strain, Kenneth, additional, Weinert, Michael, additional, and Danzmann, Karsten, additional

Published
2023
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22. Quantum engineering of squeezed states for quantum communication and metrology

Author

Vahlbruch, Henning, Chelkowski, Simon, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We report the experimental realization of squeezed quantum states of light, tailored for new applications in quantum communication and metrology. Squeezed states in a broad Fourier frequency band down to 1 Hz has been observed for the first time. Nonclassical properties of light in such a low frequency band is required for high efficiency quantum information storage in electromagnetically induced transparency (EIT) media. The states observed also cover the frequency band of ultra-high precision laser interferometers for gravitational wave detection and can be used to reach the regime of quantum non-demolition interferometry. And furthermore, they cover the frequencies of motions of heavily macroscopic objects and might therefore support the attempts to observe entanglement in our macroscopic world., Comment: 12 pages, 3 figures

Published
2007
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23. Squeezed-field injection for gravitational wave interferometers

Author

Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

In a recent table-top experiment we demonstrated the compatibility of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal-recycling and squeezed field injection. The interferometer's signal to noise ratio was improved by up to 2.8 dB beyond the coherent state's shot-noise. This value was mainly limited by optical losses on the squeezed field. We present a detailed analysis of the optical losses of in our experiment and provide an estimation of the possible nonclassical performance of a future squeezed field enhanced GEO600 detector., Comment: 5 pages, 3 figures

Published
2007
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24. Demonstration of a squeezed light enhanced power- and signal-recycled Michelson interferometer

Author

Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We report on the experimental combination of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal-recycling and squeezed field injection. For the first time we experimentally prove the compatibility of especially the latter two. To achieve a broadband non-classical sensitivity improvement we applied a filter cavity for compensation of quadrature rotation. Signal to noise ratio was improved by up to 2.8 dB beyond the coherent state's shot noise. The complete set-up was stably locked for arbitrary times and characterized by injected single-sideband modulation fields., Comment: 4 pages, 3 figures

Published
2007
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25. Coherent control of vacuum squeezing in the Gravitational-Wave Detection Band

Author

Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We propose and demonstrate a coherent control scheme for stable phase locking of squeezed vacuum fields. We focus on sideband fields at frequencies from 10Hz to 10kHz which is a frequency regime of particular interest in gravitational wave detection and for which conventional control schemes have failed so far. A vacuum field with broadband squeezing covering this entire band was produced using optical parametric oscillation and characterized with balanced homodyne detection. The system was stably controlled over long periods utilizing two coherent but frequency shifted control fields. In order to demonstrate the performance of our setup the squeezed field was used for a nonclassical sensitivity improvement of a Michelson interferometer at audio frequencies., Comment: 4 pages, 4 figures

Published
2007
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26. Experimental characterization of frequency dependent squeezed light

Author

Chelkowski, Simon, Vahlbruch, Henning, Hage, Boris, Franzen, Alexander, Lastzka, Nico, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We report on the demonstration of broadband squeezed laser beams that show a frequency dependent orientation of the squeezing ellipse. Carrier frequency as well as quadrature angle were stably locked to a reference laser beam at 1064nm. This frequency dependent squeezing was characterized in terms of noise power spectra and contour plots of Wigner functions. The later were measured by quantum state tomography. Our tomograph allowed a stable lock to a local oscillator beam for arbitrary quadrature angles with one degree precision. Frequency dependent orientations of the squeezing ellipse are necessary for squeezed states of light to provide a broadband sensitivity improvement in third generation gravitational wave interferometers. We consider the application of our system to long baseline interferometers such as a future squeezed light upgraded GEO600 detector., Comment: 8 pages, 8 figures

Published
2007
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27. Observation of squeezed light with 10dB quantum noise reduction

Author

Vahlbruch, Henning, Mehmet, Moritz, Lastzka, Nico, Hage, Boris, Chelkowski, Simon, Franzen, Alexander, Gossler, Stefan, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

Squeezing of light's quantum noise requires temporal rearranging of photons. This again corresponds to creation of quantum correlations between individual photons. Squeezed light is a non-classical manifestation of light with great potential in high-precision quantum measurements, for example in the detection of gravitational waves. Equally promising applications have been proposed in quantum communication. However, after 20 years of intensive research doubts arose whether strong squeezing can ever be realized as required for eminent applications. Here we show experimentally that strong squeezing of light's quantum noise is possible. We reached a benchmark squeezing factor of 10 in power (10dB). Thorough analysis reveals that even higher squeezing factors will be feasible in our setup., Comment: 10 pages, 4 figures

Published
2007
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28. Coherent control of broadband vacuum squeezing

Author

Chelkowski, Simon, Vahlbruch, Henning, Danzmann, Karsten, and Schnabel, Roman

Subjects
Quantum Physics
Abstract

We present the observation of optical fields carrying squeezed vacuum states at sideband frequencies from 10Hz to above 35MHz. The field was generated with type-I optical parametric oscillation below threshold at 1064nm. A coherent, unbalanced classical modulation field at 40MHz enabled the generation of error signals for stable phase control of the squeezed vacuum field with respect to a strong local oscillator. Broadband squeezing of approximately -4dB was measured with balanced homodyne detection. The spectrum of the squeezed field allows a quantum noise reduction of ground-based gravitational wave detectors over their full detection band, regardless of whether homodyne readout or radio-frequency heterodyne readout is used., Comment: 9 pages, 8 figures

Published
2007
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29. Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors

Author

Harms, Jan, Chen, Yanbei, Chelkowski, Simon, Franzen, Alexander, Vahlbruch, Henning, Danzmann, Karsten, and Schnabel, Roman

Subjects
General Relativity and Quantum Cosmology
Abstract

We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the vacuum entering the dark port and frequency-dependent homodyne detection. We combine the work of Buonanno and Chen on the quantum noise of signal-recycled interferometers with ordinary input-output optics, and the work of Kimble el al. on frequency-dependent input-output optics with conventional interferometers. Analytical formulas for the optimal input and output frequency dependencies are obtained. It is shown that injecting squeezed light with the optimal frequency-dependent squeezing angle into the dark port yields an improvement on the noise spectral density by a factor of exp(-2r) (in power) over the entire squeezing bandwidth, where r is the squeezing parameter. It is further shown that frequency-dependent (variational) homodyne read-out leads to an additional increase in sensitivity which is significant in the wings of the doubly resonant structure. The optimal variational input squeezing in case of an ordinary output homodyne detection is shown to be realizable by applying two optical filters on a frequency-independent squeezed vacuum. Throughout this paper, we take as example the signal-recycled topology currently being completed at the GEO600 site. However, theoretical results obtained here are also applicable to the proposed topology of Advanced LIGO., Comment: 10 pages, 5 figures

Published
2003
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31. 30 W ultra-stable laser light at 2128 nm for future gravitational-wave observatories

Author

Gurs, Julian, Bode, Nina, Darsow-Fromm, Christian, Vahlbruch, Henning, Gewecke, Pascal, Steinlechner, Sebastian, Willke, Benno, Schnabel, Roman, Gurs, Julian, Bode, Nina, Darsow-Fromm, Christian, Vahlbruch, Henning, Gewecke, Pascal, Steinlechner, Sebastian, Willke, Benno, and Schnabel, Roman

Abstract

Thermal noise of the dielectric mirror coatings can limit laser-optical high-precision measurements. Coatings made of amorphous silicon and silicon nitride could provide a remedy for both gravitational-wave detectors and optical clocks. However, the absorption spectra of these materials require laser wavelengths around 2 $\mu$m. For GW detectors, ultra-stable laser light of tens or hundreds of watts is needed. Here, we report the production of nearly 30 W of ultra-stable laser light at 2128 nm by frequency conversion of 1064 nm light from a master oscillator power amplifier system. We achieve an external conversion efficiency of (67.5 $\pm$ 0.5) % via optical parametric oscillation and a relative power noise in the range of $10^{-6}$/$\sqrt{\text{Hz}}$ at 100 Hz, which is almost as low as that of the input light and underlines the potential of our approach., Comment: 4 pages, 3 figures, LIGO Document P2300369

Published
2023

32. Demonstration of length control for a filter cavity with coherent control sidebands

Author

Aritomi, Naoki, primary, Zhao, Yuhang, additional, Capocasa, Eleonora, additional, Leonardi, Matteo, additional, Eisenmann, Marc, additional, Page, Michael, additional, Guo, Yuefan, additional, Polini, Eleonora, additional, Tomura, Akihiro, additional, Arai, Koji, additional, Aso, Yoichi, additional, van Beuzekom, Martin, additional, Huang, Yao-Chin, additional, Lee, Ray-Kuang, additional, Lück, Harald, additional, Miyakawa, Osamu, additional, Prat, Pierre, additional, Shoda, Ayaka, additional, Tacca, Matteo, additional, Takahashi, Ryutaro, additional, Vahlbruch, Henning, additional, Vardaro, Marco, additional, Wu, Chien-Ming, additional, Barsuglia, Matteo, additional, and Flaminio, Raffaele, additional

Published
2022
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35. Improving the stability of frequency-dependent squeezing with bichromatic control of filter cavity length, alignment, and incident beam pointing

Author

Zhao, Yuhang, primary, Capocasa, Eleonora, additional, Eisenmann, Marc, additional, Aritomi, Naoki, additional, Page, Michael, additional, Guo, Yuefan, additional, Polini, Eleonora, additional, Arai, Koji, additional, Aso, Yoichi, additional, van Beuzekom, Martin, additional, Huang, Yao-Chin, additional, Lee, Ray-Kuang, additional, Lück, Harald, additional, Miyakawa, Osamu, additional, Prat, Pierre, additional, Shoda, Ayaka, additional, Tacca, Matteo, additional, Takahashi, Ryutaro, additional, Vahlbruch, Henning, additional, Vardaro, Marco, additional, Wu, Chien-Ming, additional, Leonardi, Matteo, additional, Barsuglia, Matteo, additional, and Flaminio, Raffaele, additional

Published
2022
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37. Direct limits for scalar field dark matter from a gravitational-wave detector

Author

Vermeulen, Sander M., primary, Relton, Philip, additional, Grote, Hartmut, additional, Raymond, Vivien, additional, Affeldt, Christoph, additional, Bergamin, Fabio, additional, Bisht, Aparna, additional, Brinkmann, Marc, additional, Danzmann, Karsten, additional, Doravari, Suresh, additional, Kringel, Volker, additional, Lough, James, additional, Lück, Harald, additional, Mehmet, Moritz, additional, Mukund, Nikhil, additional, Nadji, Séverin, additional, Schreiber, Emil, additional, Sorazu, Borja, additional, Strain, Kenneth A., additional, Vahlbruch, Henning, additional, Weinert, Michael, additional, Willke, Benno, additional, and Wittel, Holger, additional

Published
2021
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38. First Demonstration of 6 dB Quantum Noise Reduction in a Kilometer Scale Gravitational Wave Observatory

Author

Lough, James, Schreiber, Emil, Bergamin, Fabio, Grote, Hartmut, Mehmet, Moritz, Vahlbruch, Henning, Affeldt, Christoph, Brinkmann, Marc, Bisht, Aparna, Kringel, Volker, Lück, Harald, Mukund, Nikhil, Nadji, Severin, Sorazu, Borja, Strain, Kenneth, Weinert, Michael, Danzmann, Karsten, Lough, James, Schreiber, Emil, Bergamin, Fabio, Grote, Hartmut, Mehmet, Moritz, Vahlbruch, Henning, Affeldt, Christoph, Brinkmann, Marc, Bisht, Aparna, Kringel, Volker, Lück, Harald, Mukund, Nikhil, Nadji, Severin, Sorazu, Borja, Strain, Kenneth, Weinert, Michael, and Danzmann, Karsten

Abstract

Photon shot noise, arising from the quantum-mechanical nature of the light, currently limits the sensitivity of all the gravitational wave observatories at frequencies above one kilohertz. We report a successful application of squeezed vacuum states of light at the GEO 600 observatory and demonstrate for the first time a reduction of quantum noise up to 6.03±0.02 dB in a kilometer scale interferometer. This is equivalent at high frequencies to increasing the laser power circulating in the interferometer by a factor of 4. Achieving this milestone, a key goal for the upgrades of the advanced detectors required a better understanding of the noise sources and losses and implementation of robust control schemes to mitigate their contributions. In particular, we address the optical losses from beam propagation, phase noise from the squeezing ellipse, and backscattered light from the squeezed light source. The expertise gained from this work carried out at GEO 600 provides insight toward the implementation of 10 dB of squeezing envisioned for third-generation gravitational wave detectors.

Published
2021

39. Direct limits for scalar field dark matter from a gravitational-wave detector

Author

Grote, Hartmut, primary, Vermeulen, Sander, additional, Relton, Philip, additional, Raymond, Vivien, additional, Affeldt, Christoph, additional, Bergamin, Fabio, additional, Bisht, Aparna, additional, Brinkmann, Marc, additional, Danzmann, Karsten, additional, Doravari, Suresh, additional, Kringel, Volker, additional, Lough, James, additional, Lueck, Harald, additional, Mehmet, Moritz, additional, Mukund, Nikhil, additional, Nadji, Severin, additional, Schreiber, Emil, additional, Sorazu, Borja, additional, Strain, Kenneth, additional, Vahlbruch, Henning, additional, Weinert, Michael, additional, and Willke, Benno, additional

Published
2021
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40. The squeezed light source for the advanced virgo detector in the observation run O3

Author

Mehmet, Moritz, Vahlbruch, Henning, Mehmet, Moritz, and Vahlbruch, Henning

Abstract

From 1 April 2019 to 27 March 2020, the Advanced Virgo detector, together with the two Advanced LIGO detectors, conducted the third joint scientific observation run O3, aiming for further detections of gravitational wave signals from astrophysical sources. One of the upgrades to the Virgo detector for O3 was the implementation of the squeezed light technology to improve the detector sensitivity beyond its classical quantum shot noise limit. In this paper, we present a detailed description of the optical setup and performance of the employed squeezed light source. The squeezer was constructed as an independent, stand-alone sub-system operated in air. The generated squeezed states are tailored to exhibit high purity at intermediate squeezing levels in order to significantly reduce the interferometer shot noise level while keeping the correlated enhancement of quantum radiation pressure noise just below the actual remaining technical noise in the Advanced Virgo detector.

Published
2020

41. First Demonstration of 6 dB Quantum Noise Reduction in a Kilometer Scale Gravitational Wave Observatory

Author

Lough, James, primary, Schreiber, Emil, additional, Bergamin, Fabio, additional, Grote, Hartmut, additional, Mehmet, Moritz, additional, Vahlbruch, Henning, additional, Affeldt, Christoph, additional, Brinkmann, Marc, additional, Bisht, Aparna, additional, Kringel, Volker, additional, Lück, Harald, additional, Mukund, Nikhil, additional, Nadji, Severin, additional, Sorazu, Borja, additional, Strain, Kenneth, additional, Weinert, Michael, additional, and Danzmann, Karsten, additional

Published
2021
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46. Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors

Author

Zhao, Yuhang, primary, Aritomi, Naoki, additional, Capocasa, Eleonora, additional, Leonardi, Matteo, additional, Eisenmann, Marc, additional, Guo, Yuefan, additional, Polini, Eleonora, additional, Tomura, Akihiro, additional, Arai, Koji, additional, Aso, Yoichi, additional, Huang, Yao-Chin, additional, Lee, Ray-Kuang, additional, Lück, Harald, additional, Miyakawa, Osamu, additional, Prat, Pierre, additional, Shoda, Ayaka, additional, Tacca, Matteo, additional, Takahashi, Ryutaro, additional, Vahlbruch, Henning, additional, Vardaro, Marco, additional, Wu, Chien-Ming, additional, Barsuglia, Matteo, additional, and Flaminio, Raffaele, additional

Published
2020
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47. Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light

Author

Acernese, F., Agathos, M., Aiello, L., Allocca, A., Amato, A., Ansoldi, S., Antier, S., Arène, M., Arnaud, N., Ascenzi, S., Astone, P., Aubin, F., Collaboration, Virgo, Vahlbruch, Henning, Mehmet, Moritz, Lück, Harald, and Danzmann, Karsten

Subjects
General Relativity and Quantum Cosmology, noise, neutron, vacuum, article, ddc:530, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik
Abstract

Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the quantum limit is the injection of squeezed vacuum states of light into the interferometer's dark port. Here, we report on the successful application of this quantum technology to improve the shot noise limited sensitivity of the Advanced Virgo gravitational-wave detector. A sensitivity enhancement of up to 3.2±0.1 dB beyond the shot noise limit is achieved. This nonclassical improvement corresponds to a 5%-8% increase of the binary neutron star horizon. The squeezing injection was fully automated and over the first 5 months of the third joint LIGO-Virgo observation run O3 squeezing was applied for more than 99% of the science time. During this period several gravitational-wave candidates have been recorded.

Published
2019

49. Full band all-sky search for periodic gravitational waves in the O1 LIGO data

Author

Abbott, Benjamin P., Abbott, Rich, Abbott, Thomas D., Acernese, Fausto, Ackley, Kendall, Adams, Carl, Adams, Thomas, Addesso, Paolo, Adhikari, Rana X., Adya, Vaishali B., Affeldt, Christoph, Afrough, Mohammad, Agarwal, Bhanu, Agathos, Michalis, Agatsuma, Kazuhiro, Aggarwal, Nancy, Aguiar, Odylio D., Aiello, Lorenzo, Ain, Anirban, Allen, Bruce, Allen, Gabrielle, Allocca, Annalisa, Altin, Paul A., Amato, Alex, Ananyeva, Alena, Anderson, Stuart B., Anderson, Warren G., Angelova, Svetoslava V., Antier, Sarah, Appert, Stephen, Arai, Koji, Araya, Melody C., Areeda, Joseph S., Arnaud, Nicolas, Ascenzi, Stefano, Ashton, Gregory, Ast, M., Aston, Stuart M., Astone, Pia, Atallah, Dany V., Aufmuth, Peter, Aulbert, Carsten, AultONeal, K., Austin, Corey, Avila-Alvarez, A., Babak, Stanislav, Bacon, Philippe, Bader, Maria K.M., Bae, Sangwook, Baker, Paul T., Baldaccini, Francesca, Ballardin, Giulio, Ballmer, Stefan W., Banagiri, Sharan, Barayoga, Juan C., Barclay, Sheena E., Barish, Barry C., Barker, David, Barkett, Kevin, Barone, Fabrizio, Barr, Bryan, Barsotti, Lisa, Barsuglia, Matteo, Barta, Daniel, Bartlett, Jeffrey, Bartos, Imre, Bassiri, Riccardo, Basti, Andrea, Batch, James C., Bawaj, Mateusz, Bayley, Joseph C., Bazzan, Marco, Bécsy, Bence, Beer, Christian, Bejger, Michal, Belahcene, Imene, Bell, Angus S., Berger, Beverly K., Bergmann, Gerald, Bero, John J., Berry, Christopher P.L., Bersanetti, Diego, Bertolini, Alessandro, Betzwieser, Joseph, Bhagwat, Swetha, Bhandare, Rohan, Bilenko, Igor A., Billingsley, Garilynn, Billman, Chris R., Birch, Jeremy, Birney, Ross, Birnholtz, Ofek, Biscans, Sebastien, Biscoveanu, Sylvia, Bisht, Aparna, Bitossi, Massimiliano, Biwer, Christopher, Bizouard, Marieanne A., Blackburn, J.K., Blackman, Jonathan, Blair, Carl D., Blair, David G., Blair, Ryan M., Bloemen, Steven, Bock, Oliver, Bode, Nina, Boer, Michel, Bogaert, Gilles, Bohe, Alejandro, Bondu, Francois, Bonilla, Edgard, Bonnand, Romain, Boom, Boris A., Bork, Rolf, Boschi, Valerio, Bose, Sukanta, Bossie, Ken, Bouffanais, Yann, Bozzi, Antonella, Bradaschia, Carlo, Brady, Patrick R., Branchesi, Marica, Brau, Jim E., Briant, Tristan, Brillet, Alain, Brinkmann, Marc, Brisson, Violette, Brockill, Patrick, Broida, Jacob E., Brooks, Aidan F., Brown, Duncan A., Brown, Daniel D., Brunett, Sharon, Buchanan, Christopher C., Buikema, Aaron, Bulik, Tomasz, Bulten, Henk J., Buonanno, Alessandra, Buskulic, Damir, Buy, Christelle, Byer, Robert L., Cabero, Miriam, Cadonati, Laura, Cagnoli, Giampietro, Cahillane, Craig, Calderón Bustillo, J., Callister, Thomas A., Calloni, Enrico, Camp, Jordan B., Canepa, Maurizio, Canizares, Priscilla, Cannon, Kipp C., Cao, H., Cao, Junwei, Capano, Collin D., Capocasa, Eleonora, Carbognani, Franco, Caride, Santiago, Carney, Matthew F., Casanueva Diaz, J., Casentini, Claudio, Caudill, Sarah, Cavaglià, Marco, Cavalier, Fabien, Cavalieri, Roberto, Cella, Giancarlo, Cepeda, Christian B., Cerdá-Durán, P., Cerretani, Giovanni, Cesarini, Elisabetta, Chamberlin, Sydney J., Chan, Manleong, Chao, Shiuh, Charlton, Philip, Chase, Eve, Chassande-Mottin, E., Chatterjee, Deep, Cheeseboro, Belinda D., Chen, H.Y., Chen, Xu, Chen, Yanbei, Cheng, H.-P., Chia, Hanyu Y., Chincarini, Andrea, Chiummo, Antonino, Chmiel, Theresa, Cho, Heesuk S., Cho, M., Chow, Jong H., Christensen, Nelson, Chu, Qi, Chua, Alvin J.K., Chua, Sheon, Chung, A.K.W., Chung, Shinkee, Ciani, Giacomo, Ciecielag, P., Ciolfi, Riccardo, Cirelli, Carissa E., Cirone, Alessio, Clara, Filiberto, Clark, James A., Clearwater, Patrick, Cleva, Frederic, Cocchieri, Camillo, Coccia, Eugenio, Cohadon, P.-F., Cohen, David, Colla, Alberto, Collette, Christophe G., Cominsky, Lynn R., Constancio, M., Conti, Livia, Cooper, Sam J., Corban, Paul, Corbitt, Thomas R., Cordero-Carrión, I., Corley, Kenneth R., Cornish, Neil, Corsi, Alessandra, Cortese, Stefano, Costa, Cesar A., Coughlin, Eric T., Coughlin, Michael W., Coughlin, Scott B., Coulon, J.-P., Countryman, Stefan T., Couvares, Peter, Covas, Pep B., Cowan, Erika E., Coward, David M., Cowart, Matthew J., Coyne, Dennis C., Coyne, Robert, Creighton, Jolien D.E., Creighton, Teviet D., Cripe, Jonathan, Crowder, Sgwynne G., Cullen, Torrey J., Cumming, Alan, Cunningham, Liam, Cuoco, Elena, Dal Canton, Tito, Dálya, Gergely, Danilishin, Stefan L., D'Antonio, S., Danzmann, Karsten, Dasgupta, Arnab, Da Silva Costa, C.F., Dattilo, Vincenzo, Dave, Ishant, Davier, Michel, Davis, Derek, Daw, Edward J., Day, Brian, De, Soumi, Debra, D., Degallaix, Jerome, De Laurentis, M., Deléglise, Samuel, Del Pozzo, W., Demos, Nicholas, Denker, Timo, Dent, Thomas, De Pietri, R., Dergachev, Vladimir, De Rosa, R., DeRosa, R.T., De Rossi, C., DeSalvo, R., de Varona, O., Devenson, Jan, Dhurandhar, Sanjeev, Díaz, Mario C., Di Fiore, L., Di Giovanni, M., Di Girolamo, T., Di Lieto, A., Di Pace, S., Di Palma, I., Di Renzo, F., Doctor, Zoheyr, Dolique, Vincent, Donovan, Fred, Dooley, Katherine L., Doravari, Suresh, Dorosh, O., Dorrington, Iain, Douglas, Rebecca, Dovale Álvarez, M., Downes, Thomas P., Drago, Marco, Dreissigacker, Christoph, Driggers, Jenne C., Du, Zhihui, Ducrot, Marine, Dupej, Peter, Dwyer, Sheila E., Edo, Tega B., Edwards, Matthew C., Effler, Anamaria, Eggenstein, H.-B., Ehrens, Phil, Eichholz, Johannes, Eikenberry, Stephen S., Eisenstein, Robert A., Essick, Reed C., Estevez, Dimitri, Etienne, Zachariah B., Etzel, Todd, Evans, Matthew, Evans, Tom M., Factourovich, Maxim, Fafone, Viviana, Fair, Hannah, Fairhurst, Stephen, Fan, Xilong, Farinon, Stefania, Farr, Benjamin, Farr, Will M., Fauchon-Jones, E.J., Favata, Marc, Fays, Maxime, Fee, Campbell, Fehrmann, Henning, Feicht, Jon, Fejer, Martin M., Fernandez-Galiana, A., Ferrante, Isidoro, Ferreira, Elvis C., Ferrini, Federico, Fidecaro, Francesco, Finstad, Daniel, Fiori, Irene, Fiorucci, Donatella, Fishbach, Maya, Fisher, Ryan P., Fitz-Axen, M., Flaminio, Raffaele, Fletcher, Mark, Fong, Heather, Font, J.A., Forsyth, Perry W.F., Forsyth, Steven S., Fournier, J.-D., Frasca, Sergio, Frasconi, Franco, Frei, Zsolt, Freise, Andreas, Frey, Raymond, Frey, Valentin, Fries, Eric M., Fritschel, Peter, Frolov, Valery V., Fulda, Paul, Fyffe, Michael, Gabbard, Hunter, Gadre, Bhooshan U., Gaebel, Sebastian M., Gair, Jonathan R., Gammaitoni, Luca, Ganija, Miftar R., Gaonkar, Sharad G., Garcia-Quiros, C., Garufi, Fabio, Gateley, B., Gaudio, Sergio, Gaur, Gurudatt, Gayathri, V., Gehrels, Neil, Gemme, Gianluca, Genin, Eric, Gennai, Alberto, George, Daniel, George, Jogy, Gergely, Laszlo, Germain, Vincent, Ghonge, Sudarshan, Ghosh, Abhirup, Ghosh, Archisman, Ghosh, Shaon, Giaime, Joe A., Giardina, K.D., Giazotto, Adalberto, Gill, Kiranjyot, Glover, Lamar, Goetz, Evan, Goetz, Ryan, Gomes, Sandra, Goncharov, Boris, González, Gabriela, Gonzalez Castro, J.M., Gopakumar, A., Gorodetsky, Michael L., Gossan, Sarah E., GOSSELIN, Matthieu, Gouaty, Romain, Grado, Aniello, Graef, Christian, Granata, Massimo, Grant, Alastair, Gras, Slawomir, Gray, Corey, Greco, Giuseppe, Green, Anna C., Gretarsson, Elizabeth M., Groot, Paul, Grote, Hartmut, Grunewald, Steffen, Gruning, Pierre, Guidi, Gianluca M., Guo, Xiangyu, Gupta, Anuradha, Gupta, Manojipr K., Gushwa, Kaitlin E., Gustafson, Eric K., Gustafson, R., Halim, O., Hall, Bernard R., Hall, Evan D., Hamilton, Eleanor Z., Hammond, Giles, Haney, Maria, Hanke, Manuela M., Hanks, Jonathan, Hanna, Chad, Hannam, Mark D., Hannuksela, Otto A., Hanson, Joe, Hardwick, Terra, Harms, Jan, Harry, Gregg M., Harry, Ian W., Hart, Martin J., Haster, C.-J., Haughian, Karen, Healy, James, Heidmann, Antoine, Heintze, Matthew C., Heitmann, Henrich, Hello, Patrice, Hemming, Gary, Hendry, Martin, Heng, I.S., Hennig, J., Heptonstall, Alastair W., Heurs, Michele, Hild, Stefan, Hinderer, Tanja, Hoak, Daniel, Hofman, David, Holt, Kathy, Holz, Daniel E., Hopkins, Paul, Horst, Christian, Hough, James, Houston, Ewan A., Howell, Eric J., Hreibi, A., Hu, Yiming M., Huerta, Eliu A., Huet, Dominique, Hughey, Brennan, Husa, Sascha, Huttner, Sabina H., Huynh-Dinh, T., Indik, Nathaniel, Inta, Ra, Intini, Giuseppe, Isa, Hafizah N., Isac, J.-M., Isi, Max, Iyer, Bala R., Izumi, Kiwamu, Jacqmin, Thibaut, Jani, Karan, Jaranowski, Piotr, Jawahar, Sharat, Jiménez-Forteza, F., Johnson, Warren W., Jones, D.I., Jones, Russell, Jonker, Reinier J.G., Ju, L., Junker, Jonas, Kalaghatgi, Chinmay V., Kalogera, Vassiliki, Kamai, Brittany, Kandhasamy, Shivaraj, Kang, Gungwon, Kanner, Jonah B., Kapadia, Shasvath J., Karki, Sudarshan, Karvinen, Kai S., Kasprzack, Marie, Katolik, Michael, Katsavounidis, Erik, Katzman, William, Kaufer, Steffen, Kawabe, Keita, Kéfélian, Fabien, Keitel, David, Kemball, Athol J., Kennedy, Ross, Kent, Christopher, Key, Joey S., Khalili, Farit Y., Khan, I., Khan, Sebastian, Khan, Ziauddin, Khazanov, Efim A., Kijbunchoo, Nutsinee, Kim, Chunglee, Kim, Jeongcho C., Kim, Kyungmin, Kim, Won, Kim, Whansun S., Kim, Y.-M., Kimbrell, Seth J., King, Eleanor J., King, Peter J., Kinley-Hanlon, M., Kirchhoff, Robin, Kissel, Jeffrey S., Kleybolte, Lisa, Klimenko, Sergei, Knowles, Tyler D., Koch, Philip, Koehlenbeck, Sina M., Koley, Soumen, Kondrashov, Veronica, Kontos, Antonios, Korobko, Mikhail, Korth, William Z., Kowalska, Izabela, Kozak, Dan B., Krämer, Christina, Kringel, Volker, Krishnan, Badri, Królak, Andrzej, Kuehn, Gerrit, Kumar, Prayush, Kumar, Rakesh, Kumar, Sumit, Kuo, L., Kutynia, Adam, Kwang, Shawn, Lackey, Benjamin D., Lai, K.H., Landry, Michael, Lang, Ryan N., Lange, Jacob, Lantz, Brian, Lanza, Robert K., Lartaux-Vollard, A., Lasky, Paul D., Laxen, Michael, Lazzarini, Albert, Lazzaro, Claudia, Leaci, Paola, Leavey, Sean, Lee, C.H., Lee, Hyunkyu K., Lee, H.M., Lee, Hyungwon W., Lee, K., Lehmann, Johannes, Lenon, Amber, Leonardi, Matteo, Leroy, Nicolas, Letendre, Nicolas, Levin, Yuri, Li, Tjonnie G.F., Linker, Seth D., Littenberg, Tyson B., Liu, J., Lo, R.K.L., Lockerbie, Nick A., London, Lionel T., Lord, Jaysin E., Lorenzini, Matteo, Loriette, Vincent, Lormand, Marc, Losurdo, Giovanni, Lough, James D., Lovelace, Geoffrey, Lück, Harald, Lumaca, Diana, Lundgren, Andrew P., Lynch, Ryan, Ma, Y., Macas, Ronaldas, Macfoy, Sean, Machenschalk, Bernd, Macinnis, M., Macleod, Duncan M., Magaña Hernandez, I., Magaña-Sandoval, F., Magaña Zertuche, L., Magee, Ryan M., Majorana, Ettore, Maksimovic, Ivan, Man, N., Mandic, Vuk, Mangano, Valentina, Mansell, Georgia L., Manske, Michael, Mantovani, Maddalena, Marchesoni, Fabio, Marion, Frederique, Márka, Szabolcs, Márka, Zsuzsanna, Markakis, Charalampos, Markosyan, Ashot S., Markowitz, Aaron, Maros, E., Marquina, Antonio, Martelli, Filippo, Martellini, Lionel, Martin, Ian W., Martin, Rodica M., Martynov, Denis V., Mason, Ken, Massera, Elena, Masserot, Alain, Massinger, Thomas J., Masso-Reid, M., Mastrogiovanni, Simone, Matas, Andrew, Matichard, Fabrice, Matone, Luca, Mavalvala, Nergis, Mazumder, Nairwita, McCarthy, R., Mcclelland, D.E., Mccormick, S., McCuller, L., McGuire, S.C., Mcintyre, G., Mciver, J., McManus, David J., McNeill, L., McRae, T., McWilliams, S.T., Meacher, Duncan, Meadors, Grant D., Mehmet, Moritz, Meidam, Jeroen, Mejuto-Villa, E., Melatos, Andrew, Mendell, Gregory, Mercer, R.A., Merilh, Edmond L., Merzougui, Mourad, Meshkov, Syd, Messenger, Chris, Messick, Cody, Metzdorff, R., Meyers, Patrick M., Miao, Haixing, Michel, Christophe, Middleton, Hannah, Mikhailov, Eugeniy E., Milano, Leopoldo, Miller, Andrewlawrence L., Miller, Brandon B., Miller, John, Millhouse, Meg, Milovich-Goff, M.C., Minazzoli, Olivier, Minenkov, Yuri, Ming, Jing, Mishra, Chandra, Mitra, Sanjit, Mitrofanov, Valery P., Mitselmakher, Guenakh, Mittleman, Richard, Moffa, Donald, Moggi, Andrea, Mogushi, Kentaro, Mohan, Martin, Mohapatra, S.R.P., Montani, Matteo, Moore, Christopher J., Moraru, Dan, Moreno, Gerardo, Morriss, Sean R., Mours, Benoit, Mow-Lowry, C.M., Mueller, Guido, Muir, Alistair W., Mukherjee, Arunava, Mukherjee, Debnandini, Mukherjee, Soma, Mukund, Nikhil, Mullavey, Adam, Munch, Jesper, Muñiz, Erik A., Muratore, Martina, Murray, 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Abstract

We report on a new all-sky search for periodic gravitational waves in the frequency band 475-2000 Hz and with a frequency time derivative in the range of [-1.0,+0.1]×10-8 Hz/s. Potential signals could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the data from Advanced LIGO's first observational run O1. No gravitational-wave signals were observed, and upper limits were placed on their strengths. For completeness, results from the separately published low-frequency search 20-475 Hz are included as well. Our lowest upper limit on worst-case (linearly polarized) strain amplitude h0 is ∼4×10-25 near 170 Hz, while at the high end of our frequency range, we achieve a worst-case upper limit of 1.3×10-24. For a circularly polarized source (most favorable orientation), the smallest upper limit obtained is ∼1.5×10-25. © 2018 American Physical Society.

Published
2018

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