20 results on '"Marijn A. M. Versteegh"'
Search Results
2. Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
- Author
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Klaus D. Jöns, Lucas Schweickert, Marijn A. M. Versteegh, Dan Dalacu, Philip J. Poole, Angelo Gulinatti, Andrea Giudice, Val Zwiller, and Michael E. Reimer
- Subjects
Medicine ,Science - Abstract
Abstract Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell’s inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (S CHSH > 2) by up to 9.3 standard deviations. By using a novel quasi-resonant excitation scheme at the wurtzite InP nanowire resonance to reduce multi-photon emission, the entanglement fidelity (F = 0.817 ± 0.002) is further enhanced without temporal post-selection, allowing for the violation of Bell’s inequality in the rectilinear-circular basis by 25 standard deviations. Our results on nanowire-based quantum light sources highlight their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.
- Published
- 2017
- Full Text
- View/download PDF
3. Erratum: Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
- Author
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Klaus D. Jöns, Lucas Schweickert, Marijn A. M. Versteegh, Dan Dalacu, Philip J. Poole, Angelo Gulinatti, Andrea Giudice, Val Zwiller, and Michael E. Reimer
- Subjects
Medicine ,Science - Abstract
A correction to this article has been published and is linked from the HTML version of this paper. The error has been fixed in the paper.
- Published
- 2017
- Full Text
- View/download PDF
4. Rydberg excitons in Cu2O microcrystals grown on a silicon platform
- Author
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Samuel Gyger, Birgit Kunert, Ali W. Elshaari, Stephan Steinhauer, André Mysyrowicz, Marijn A. M. Versteegh, Val Zwiller, Department of Applied Physics, Royal Institute of Technology [Stockholm] (KTH ), Institute of Solid State Physics [Graz] (ISSP), Graz University of Technology [Graz] (TU Graz), Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
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Materials science ,Silicon ,Exciton ,chemistry.chemical_element ,02 engineering and technology ,7. Clean energy ,01 natural sciences ,symbols.namesake ,Condensed Matter::Materials Science ,Photovoltaics ,0103 physical sciences ,General Materials Science ,010306 general physics ,Materials of engineering and construction. Mechanics of materials ,Quantum optics ,Thermal oxidation ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,business.industry ,021001 nanoscience & nanotechnology ,Semiconductor ,chemistry ,Mechanics of Materials ,Rydberg formula ,symbols ,TA401-492 ,Optoelectronics ,Photonics ,0210 nano-technology ,business - Abstract
Cuprous oxide (Cu2O) is a semiconductor with large exciton binding energy and significant technological importance in applications such as photovoltaics and solar water splitting. It is also a superior material system for quantum optics that enabled the observation of intriguing phenomena, such as Rydberg excitons as solid-state analogue to highly-excited atomic states. Previous experiments related to excitonic properties focused on natural bulk crystals due to major difficulties in growing high-quality synthetic samples. Here, the growth of Cu2O microcrystals with excellent optical material quality and very low point defect levels is presented. A scalable thermal oxidation process is used that is ideally suited for integration on silicon, demonstrated by on-chip waveguide-coupled Cu2O microcrystals. Moreover, Rydberg excitons in site-controlled Cu2O microstructures are shown, relevant for applications in quantum photonics. This work paves the way for the wide-spread use of Cu2O in optoelectronics and for the development of novel device technologies. Cu2O is of great interest for its excitonic properties, yet challenges in its fabrication means that most experiments focus on naturally occurring samples. Here, scalable thermal oxidation is reported for the growth of Cu2O with low-defect content, allowing the observation of Rydberg excitons.
- Published
- 2020
5. Giant Rydberg excitons in Cu2O probed by photoluminescence excitation spectroscopy
- Author
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Marijn A. M. Versteegh, Stephan Steinhauer, Josip Bajo, Thomas Lettner, Ariadna Soro, Alena Romanova, Samuel Gyger, Lucas Schweickert, André Mysyrowicz, and Val Zwiller
- Published
- 2021
6. Entanglement distribution over a 96-km-long submarine optical fiber
- Author
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Fabian Steinlechner, René van der Molen, Sergiy M. Dobrovolskiy, Alberto Mura, Hannes Hubel, Julien Zichi, Sören Wengerowsky, Anton Zeilinger, Massimo Inguscio, André Xuereb, Davide Calonico, Johannes W. N. Los, Siddarth Koduru Joshi, Thomas Scheidl, Marijn A. M. Versteegh, Rupert Ursin, Liu Bo, Val Zwiller, and Publica
- Subjects
Photon ,Optical fiber ,quantum key distribution ,Computer science ,Quantum entanglement ,Fiber optics ,quantum entanglement ,Quantum key distribution ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,QETLabs ,Quantum cryptography ,Polarization-entangled photons ,law ,0103 physical sciences ,Optical fibers ,010306 general physics ,Quantum information science ,Quantum ,Computer Science::Cryptography and Security ,Multidisciplinary ,business.industry ,Photons -- Polarization ,Physics ,Telecommunication systems ,Electrical engineering ,polarization-entangled photons ,Quantum Physics ,Telecommunications network ,Cables, Submarine ,Physical Sciences ,quantum cryptography ,business - Abstract
Quantum entanglement is one of the most extraordinary effects in quantum physics, with many applications in the emerging field of quantum information science. In particular, it provides the foundation for quantum key distribution (QKD), which promises a conceptual leap in information security. Entanglement-based QKD holds great promise for future applications owing to the possibility of device-independent security and the potential of establishing global-scale quantum repeater networks. While other approaches to QKD have already reached the level of maturity required for operation in absence of typical laboratory infrastructure, comparable field demonstrations of entanglement-based QKD have not been performed so far. Here, we report on the successful distribution of polarization-entangled photon pairs between Malta and Sicily over 96 km of submarine optical telecommunications fiber. We observe around 257 photon pairs per second, with a polarization visibility above 90%. Our results show that QKD based on polarization entanglement is now indeed viable in long-distance fiber links. This field demonstration marks the longest-distance distribution of entanglement in a deployed telecommunications network and demonstrates an international submarine quantum communication channel. This opens up myriad possibilities for future experiments and technological applications using existing infrastructure., peer-reviewed
- Published
- 2019
7. Proximitized Josephson junctions in highly-doped InAs nanowires robust to optical illumination
- Author
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Dmitry Solenov, Elia Strambini, Lucia Sorba, Lucas Schweickert, Valentina Zannier, Francesco Giazotto, Thomas Lettner, Lily Yang, Stephan Steinhauer, and Marijn A. M. Versteegh
- Subjects
Josephson effect ,optical absorption ,Materials science ,Photon ,Nanowire ,FOS: Physical sciences ,Physics::Optics ,Bioengineering ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Superconductivity (cond-mat.supr-con) ,Condensed Matter::Materials Science ,Condensed Matter::Superconductivity ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,General Materials Science ,Electrical and Electronic Engineering ,Superconductivity ,Condensed Matter - Mesoscale and Nanoscale Physics ,business.industry ,Scattering ,Condensed Matter - Superconductivity ,Mechanical Engineering ,superconductivity ,General Chemistry ,Semiconductor ,021001 nanoscience & nanotechnology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,0104 chemical sciences ,nanowires ,Mechanics of Materials ,Proximity effect (audio) ,proximity effect ,Optoelectronics ,Photonics ,0210 nano-technology ,business - Abstract
We have studied the effects of optical-frequency light on proximitized InAs/Al Josephson junctions based on highly n-doped InAs nanowires at varying incident photon flux and at three different photon wavelengths. The experimentally obtained IV curves were modeled using a resistively shunted junction model which takes scattering at the contact interfaces into account. Despite the fact that the InAs weak link is photosensitive, the Josephson junctions were found to be surprisingly robust, interacting with the incident radiation only through heating, whereas above the critical current our devices showed non-thermal effects resulting from photon exposure. Our work indicates that Josephson junctions based on highly-doped InAs nanowires can be integrated in close proximity to photonic circuits. The results also suggest that such junctions can be used for optical-frequency photon detection through thermal processes by measuring a shift in critical current.
- Published
- 2021
8. Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre
- Author
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Julien Zichi, Sören Wengerowsky, Johannes W. N. Los, Bo Liu, Alberto Mura, Massimo Inguscio, René van der Molen, Val Zwiller, André Xuereb, Thomas Scheidl, Siddarth Koduru Joshi, Rupert Ursin, Davide Calonico, Fabian Steinlechner, Anton Zeilinger, Sergiy M. Dobrovolskiy, Marijn A. M. Versteegh, and Publica
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optical fiber ,Photon ,Quantum information ,Computer Networks and Communications ,FOS: Physical sciences ,02 engineering and technology ,Quantum entanglement ,Quantum key distribution ,01 natural sciences ,Bristol Quantum Information Institute ,lcsh:QA75.5-76.95 ,chromatic dispersion ,QETLabs ,Optics ,cables ,Quantum state ,0103 physical sciences ,Computer Science (miscellaneous) ,010306 general physics ,Single photons and quantum effects ,Physics ,Repeater ,Quantum network ,Bell state ,polarization ,Quantum optics ,Quantum Physics ,business.industry ,Photons -- Polarization ,photon ,Statistical and Nonlinear Physics ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,Photonics ,Computational Theory and Mathematics ,lcsh:Electronic computers. Computer science ,0210 nano-technology ,business ,Quantum Physics (quant-ph) ,lcsh:Physics ,Optical fibers -- Testing - Abstract
Quantum key distribution (QKD) based on entangled photon pairs holds the potential for repeater-based quantum networks connecting clients over long distance. We demonstrate long-distance entanglement distribution by means of polarisation-entangled photon pairs through two successive deployed 96 km-long telecommunications fibres in the same submarine cable. One photon of each pair was detected directly after the source, while the other travelled the fibre cable in both directions for a total distance of 192 km and attenuation of 48 dB. The observed two-photon Bell state exhibited a fidelity 85% $\pm$ 2% and was stable over several hours. We employed neither active stabilisation of the quantum state nor chromatic dispersion compensation for the fibre., 7 pages, 3 figures
- Published
- 2020
9. A significant-loophole-free test of Bell's theorem with entangled photons
- Author
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Fabian Steinlechner, Soeren Wengerowsky, Morgan W. Mitchell, Thomas Gerrits, Rupert Ursin, Anton Zeilinger, Jan-Åke Larsson, Johannes Handsteiner, Carlos Abellan, Lynden K. Shalm, Johannes Kofler, Sae Woo Nam, Waldimar Amaya, Adriana E. Lita, Marissa Giustina, Armin Hochrainer, Kevin Phelan, Joern Beyer, Bernhard Wittmann, Thomas Scheidl, and Marijn A. M. Versteegh
- Subjects
Bell state ,Frequentist probability ,Photon ,010308 nuclear & particles physics ,Quantum Physics ,01 natural sciences ,Theoretical physics ,Quantum nonlocality ,Photon entanglement ,Bell's theorem ,Quantum mechanics ,0103 physical sciences ,010306 general physics ,Quantum ,Quantum teleportation ,Mathematics - Abstract
John Bell’s theorem of 1964 states that local elements of physical reality, existing independent of measurement, are inconsistent with the predictions of quantum mechanics (Bell, J. S. (1964), Physics (College. Park. Md). Specifically, correlations between measurement results from distant entangled systems would be smaller than predicted by quantum physics. This is expressed in Bell’s inequalities. Employing modifications of Bell’s inequalities, many experiments have been performed that convincingly support the quantum predictions. Yet, all experiments rely on assumptions, which provide loopholes for a local realist explanation of the measurement. Here we report an experiment with polarization-entangled photons that simultaneously closes the most significant of these loopholes. We use a highly efficient source of entangled photons, distributed these over a distance of 58.5 meters, and implemented rapid random setting generation and high-efficiency detection to observe a violation of a Bell inequality with high statistical significance. The merely statistical probability of our results to occur under local realism is less than 3.74×10-31, corresponding to an 11.5 standard deviation effect.
- Published
- 2017
10. Erratum: Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
- Author
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D. Dalacu, Michael E. Reimer, Val Zwiller, Andrea Giudice, Angelo Gulinatti, Philip J. Poole, Klaus D. Jöns, Lucas Schweickert, and Marijn A. M. Versteegh
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010302 applied physics ,Physics ,Multidisciplinary ,Photon ,Inequality ,media_common.quotation_subject ,Science ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Quantum mechanics ,0103 physical sciences ,Medicine ,Erratum ,0210 nano-technology ,media_common - Abstract
Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell's inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (S
- Published
- 2017
11. Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
- Author
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Andrea Giudice, Michael E. Reimer, Klaus D. Jöns, Val Zwiller, Angelo Gulinatti, Dan Dalacu, Lucas Schweickert, Marijn A. M. Versteegh, and Philip J. Poole
- Subjects
Photon ,Quantum information ,Other Physics Topics ,Science ,FOS: Physical sciences ,Physics::Optics ,02 engineering and technology ,Quantum entanglement ,Quantum key distribution ,01 natural sciences ,Article ,Photon entanglement ,Quantum mechanics ,0103 physical sciences ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,Bell test experiments ,010306 general physics ,Physics ,Quantum Physics ,Quantum optics ,Multidisciplinary ,sezele ,Condensed Matter - Mesoscale and Nanoscale Physics ,Annan fysik ,021001 nanoscience & nanotechnology ,Quantum dot ,Qubit ,Medicine ,0210 nano-technology ,Quantum Physics (quant-ph) - Abstract
Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell’s inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (SCHSH > 2) by up to 9.3 standard deviations. By using a novel quasi-resonant excitation scheme at the wurtzite InP nanowire resonance to reduce multi-photon emission, the entanglement fidelity (F = 0.817 ± 0.002) is further enhanced without temporal post-selection, allowing for the violation of Bell’s inequality in the rectilinear-circular basis by 25 standard deviations. Our results on nanowire-based quantum light sources highlight their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.
- Published
- 2017
12. Semiconductor devices for entangled photon pair generation: a review
- Author
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Klaus D. Jöns, Adeline Orieux, Sara Ducci, and Marijn A. M. Versteegh
- Subjects
Quantum Physics ,Photon ,business.industry ,Computer science ,Computation ,General Physics and Astronomy ,TheoryofComputation_GENERAL ,FOS: Physical sciences ,Context (language use) ,02 engineering and technology ,Quantum entanglement ,021001 nanoscience & nanotechnology ,01 natural sciences ,Engineering physics ,3. Good health ,Photon entanglement ,0103 physical sciences ,Quantum information ,Photonics ,010306 general physics ,0210 nano-technology ,business ,Quantum Physics (quant-ph) ,Quantum - Abstract
Entanglement is one of the most fascinating properties of quantum mechanical systems; when two particles are entangled the measurement of the properties of one of the two allows to instantaneously know the properties of the other, whatever the distance separating them. In parallel with fundamental research on the foundations of quantum mechanics performed on complex experimental set-ups, we assist today to a bourgeoning of quantum information technologies bound to exploit entanglement for a large variety of applications such as secure communications, metrology and computation. Among the different physical systems under investigation, those involving photonic components are likely to play a central role and in this context semiconductor materials exhibit a huge potential in terms of integration of several quantum components in miniature chips. In this article we review the recent progress in the development of semiconductor devices emitting entangled photons. We will present the physical processes allowing to generate entanglement and the tools to characterize it; we will give an overview of major recent results of the last years and highlight perspectives for future developments., Comment: Review article (58 pages, 25 figures, 240 references)
- Published
- 2017
- Full Text
- View/download PDF
13. Significant-Loophole-Free Test of Local Realism with Entangled Photons
- Author
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Kevin Phelan, M. W. M. Mitchel, Anton Zeilinger, Sae Woo Nam, Adriana E. Lita, Sören Wengerowsky, Johannes Handsteiner, Lynden K. Shalm, B. Wittmann, Thomas Scheidl, Armin Hochrainer, C. Abelan, Valerio Pruneri, Thomas Gerrits, Jörn Beyer, Marissa Giustina, Rupert Ursin, Marijn A. M. Versteegh, J. Kofer, J-A. Larson, Waldimar Amaya, and Fabian Steinlechner
- Subjects
0301 basic medicine ,Quantum optics ,Physics ,03 medical and health sciences ,Quantum nonlocality ,Photon entanglement ,Photon ,Spontaneous parametric down-conversion ,Bell's theorem ,Quantum mechanics ,030106 microbiology ,Locality ,Quantum Physics - Abstract
We report an experimental violation of a Bell inequality with strong statistical significance. Our experiment employs polarization measurements on entangled single photons and closes the locality, freedom-of-choice, fair-sampling, coincidence-time, and memory loopholes simultaneously.
- Published
- 2016
14. Significant-Loophole-Free Test of Bell’s Theorem with Entangled Photons
- Author
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Thomas Scheidl, Joern Beyer, Lynden K. Shalm, Marissa Giustina, Armin Hochrainer, Adriana E. Lita, Waldimar Amaya, Marijn A. M. Versteegh, Kevin Phelan, Soeren Wengerowsky, Valerio Pruneri, Fabian Steinlechner, Sae Woo Nam, Johannes Handsteiner, Johannes Kofler, Rupert Ursin, Morgan W. Mitchell, Carlos Abellan, Bernhard Wittmann, Jan-Åke Larsson, Anton Zeilinger, and Thomas Gerrits
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Physics ,Quantum Physics ,Bell state ,FOS: Physical sciences ,General Physics and Astronomy ,CHSH inequality ,Electrical Engineering, Electronic Engineering, Information Engineering ,Theoretical physics ,Superdeterminism ,Local hidden variable theory ,Bell's theorem ,Quantum mechanics ,Bell test experiments ,GHZ experiment ,Quantum Physics (quant-ph) ,Elektroteknik och elektronik ,No-communication theorem - Abstract
Local realism is the worldview in which physical properties of objects exist independently of measurement and where physical influences cannot travel faster than the speed of light. Bell's theorem states that this worldview is incompatible with the predictions of quantum mechanics, as is expressed in Bell's inequalities. Previous experiments convincingly supported the quantum predictions. Yet, every experiment requires assumptions that provide loopholes for a local realist explanation. Here we report a Bell test that closes the most significant of these loopholes simultaneously. Using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors, we observe a violation of a Bell inequality with high statistical significance. The purely statistical probability of our results to occur under local realism does not exceed $3.74 \times 10^{-31}$, corresponding to an 11.5 standard deviation effect., Comment: Supplementary Material is available as an arXiv ancillary file. Experimental data available on request--please contact the corresponding authors
- Published
- 2015
15. Single pairs of time-bin-entangled photons
- Author
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Valeria Dimastrodonato, Agnieszka Gocalinska, Gediminas Juska, Michael E. Reimer, Aafke A. van den Berg, Marijn A. M. Versteegh, Val Zwiller, and Emanuele Pelucchi
- Subjects
Photon ,Optical fiber ,Generation ,Nanowire ,FOS: Physical sciences ,Physics::Optics ,02 engineering and technology ,Quantum entanglement ,01 natural sciences ,Bin ,law.invention ,Photon entanglement ,law ,Quantum mechanics ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,Fiber ,010306 general physics ,Quantum information science ,Telecom-wavelength ,Physics ,Quantum Physics ,Condensed Matter - Mesoscale and Nanoscale Physics ,Nanowires ,Communication ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,3. Good health ,Quantum-dot spin ,Quantum dot ,Mode ,Quantum Physics (quant-ph) ,0210 nano-technology ,State ,Physics - Optics ,Optics (physics.optics) - Abstract
Time-bin entangled photons are ideal for long-distance quantum communication via optical fibers. Here we present a source where, even at high creation rates, each excitation pulse generates at most one time-bin entangled pair. This is important for the accuracy and security of quantum communication. Our site-controlled quantum dot generates single polarization-entangled photon pairs, which are then converted, without loss of entanglement strength, into single time-bin entangled photon pairs., Comment: 20 pages, 6 figures
- Published
- 2015
16. Observation of strongly entangled photon pairs from a nanowire quantum dot
- Author
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Angelo Gulinatti, Dan Dalacu, Marijn A. M. Versteegh, Michael E. Reimer, Klaus D. Jöns, Philip J. Poole, Val Zwiller, and Andrea Giudice
- Subjects
electron ,Photon ,Nanowire ,FOS: Physical sciences ,Physics::Optics ,General Physics and Astronomy ,Quantum entanglement ,7. Clean energy ,Article ,General Biochemistry, Genetics and Molecular Biology ,Quantum state ,Quantum mechanics ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,Physics ,polarization ,Multidisciplinary ,nanotechnology ,birefringence ,sezele ,Condensed Matter - Mesoscale and Nanoscale Physics ,business.industry ,quantum mechanics ,photon ,Quantum sensor ,quantum dot ,General Chemistry ,theoretical study ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,3. Good health ,Quantum technology ,Quantum dot ,nanowire ,observational study ,Photonics ,business - Abstract
A bright photon source that combines high-fidelity entanglement, on-demand generation, high extraction efficiency, directional and coherent emission, as well as position control at the nanoscale is required for implementing ambitious schemes in quantum information processing, such as that of a quantum repeater. Still, all of these properties have not yet been achieved in a single device. Semiconductor quantum dots embedded in nanowire waveguides potentially satisfy all of these requirements; however, although theoretically predicted, entanglement has not yet been demonstrated for a nanowire quantum dot. Here, we demonstrate a bright and coherent source of strongly entangled photon pairs from a position controlled nanowire quantum dot with a fidelity as high as 0.859 +/- 0.006 and concurrence of 0.80 +/- 0.02. The two-photon quantum state is modified via the nanowire shape. Our new nanoscale entangled photon source can be integrated at desired positions in a quantum photonic circuit, single electron devices and light emitting diodes., Article and Supplementary Information with open access published at: http://www.nature.com/ncomms/2014/141031/ncomms6298/full/ncomms6298.html
- Published
- 2014
17. Lasing in ZnO Nanowires is Electron-Hole Plasma Lasing
- Author
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Daniel Vanmaekelbergh, Jaap I. Dijkhuis, and Marijn A. M. Versteegh
- Subjects
Dye laser ,Materials science ,Condensed Matter::Other ,business.industry ,Exciton ,Nanowire ,Physics::Optics ,Electron hole ,Laser pumping ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Gain-switching ,Semiconductor laser theory ,Condensed Matter::Materials Science ,Optoelectronics ,business ,Lasing threshold - Abstract
Lasing in ZnO nanowires is often interpreted as exciton lasing. However, our experiments and theoretical calculations on the laser threshold and the emission spectrum show that ZnO nanowire lasing is electron-hole plasma lasing.
- Published
- 2011
18. Ultrafast carrier dynamics and laser action in ZnO nanowires
- Author
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Jaap I. Dijkhuis, W. Ensing, Benjamin J. M. Brenny, Marijn A. M. Versteegh, Bas Zegers, and Ruben E. C. van der Wel
- Subjects
business.industry ,Chemistry ,Nanowire ,Analytical chemistry ,Laser ,law.invention ,law ,Ionization ,Dispersion (optics) ,Optoelectronics ,Charge carrier ,Stimulated emission ,business ,Ultrashort pulse ,Excitation - Abstract
We have examined ultrafast carrier dynamics and light amplification in ZnO nanowires following subpicosecond excitation at room temperature. We performed time- and wavelength-resolved pump-probe transmission and gain measurements on a 'forest' of 100- to 500-nm thick and 20-μm long nanowires, epitaxially grown on a sapphire wafer. Measurements were done using 267-nm pump pulses for direct, but inhomogeneous excitation, and 800-nm pulses to achieve homogeneous excitation via three-photon absorption. At the highest fluences, both for 267-nm and 800-nm pump pulses, a degenerate electron-hole plasma (EHP) is generated with carrier densities of 10 25 m -3 or higher. We observed strong amplification of the probe, accompanied by a rapid decay (~ 1.5 ps) of the charge carriers. Below ~ 10 25 m -3 , the EHP becomes non-degenerate and the decay much slower. A dip in the pump-probe signal was observed, caused by ionization of probe exciton-polaritons by the pump. This effect allows for a measurement of the exciton-polariton dispersion relation and enhanced light-matter interaction in ZnO nanowires.
- Published
- 2009
19. Identical Quantum Particles and Weak Discernibility
- Author
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Marijn A. M. Versteegh and Dennis Dieks
- Subjects
Physics ,Quantum Physics ,Theoretical physics ,Argument ,Premise ,FOS: Physical sciences ,General Physics and Astronomy ,Fermion ,State (functional analysis) ,Physics and Astronomy(all) ,Quantum Physics (quant-ph) ,Quantum ,Symmetry (physics) - Abstract
We examine a recent argument that ``identical'' quantum particles with an anti-symmetric state (fermions) are weakly discernible objects, just like irreflexively related ordinary objects in situations with perfect symmetry (Black's spheres, for example). We conclude that the argument uses a silent premise that is not justified in the quantum case.
- Full Text
- View/download PDF
20. Semiconductor devices for entangled photon pair generation: a review.
- Author
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Adeline Orieux, Marijn A M Versteegh, Klaus D Jöns, and Sara Ducci
- Subjects
- *
POLYMER networks , *QUANTUM mechanics , *MECHANICS (Physics) , *PHOTONIC crystals , *PHOTONIC band gap structures - Abstract
Entanglement is one of the most fascinating properties of quantum mechanical systems; when two particles are entangled the measurement of the properties of one of the two allows the properties of the other to be instantaneously known, whatever the distance separating them. In parallel with fundamental research on the foundations of quantum mechanics performed on complex experimental set-ups, we assist today with bourgeoning of quantum information technologies bound to exploit entanglement for a large variety of applications such as secure communications, metrology and computation. Among the different physical systems under investigation, those involving photonic components are likely to play a central role and in this context semiconductor materials exhibit a huge potential in terms of integration of several quantum components in miniature chips. In this article we review the recent progress in the development of semiconductor devices emitting entangled photons. We will present the physical processes allowing the generation of entanglement and the tools to characterize it; we will give an overview of major recent results of the last few years and highlight perspectives for future developments. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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