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101. Traveling wave parametric amplifier with Josephson junctions using minimal resonator phase matching

Author

White, T. C., primary, Mutus, J. Y., additional, Hoi, I.-C., additional, Barends, R., additional, Campbell, B., additional, Chen, Yu, additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Jeffrey, E., additional, Kelly, J., additional, Megrant, A., additional, Neill, C., additional, O'Malley, P. J. J., additional, Roushan, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, Chaudhuri, S., additional, Gao, J., additional, and Martinis, John M., additional

Published
2015
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102. Photon-detecting superconducting resonators

Author

Barends, R., Klapwijk, T.M., and Gao, J.R.

Subjects
kinetic inductance detectors, noise, superconductivity, quasiparticle recombination, resonators, quasiparticle relaxation
Abstract

One of the greatest challenges in astronomy is observing star and planetary formation, redshifted distant galaxies and molecular spectral ‘fingerprints’ in the far-infrared spectrum of light, using highly sensitive and large cameras. In this thesis we investigate superconducting resonators for photon detection. In superconductors the electrons are paired. The incoming light then breaks these pairs into unpaired electrons, so-called quasiparticles, influencing the superconductor’s inductance. Consequently, the resonance frequency shifts. These resonators are extremely sensitive, since they are operated at temperatures where less than a billionth of the electrons are unpaired. By giving each resonator (or pixel) a slightly different length, like the pipes in an organ, many can be read out simultaneously. This allows for the construction of large cameras. These cameras work best when pairing is slow – the quasiparticles eventually recombine and the signal is lost – and the noise is low. In this thesis we focus on two main topics: the quasiparticle recombination process as well as the frequency noise of these resonators. At low temperatures we find relaxation times as long as milliseconds for Al and several tens of microseconds for Ta. The relaxation times clearly saturate at low temperatures in both materials, indicating an additional recombination channel in the superconducting films. The low temperature relaxation is made faster by the implantation of magnetic as well as nonmagnetic atoms, indicating that it arises from an enhancement of disorder. In addition, we show that the frequency noise mainly arises at interfaces, whereas deviations in the temperature dependence of the resonance frequency arise from dipole defects in the volume of dielectrics. Finally, we significantly decrease the noise by widening the geometry of the resonator waveguide.

Published
2009

104. Antenna coupled kinetic inductance arrays for space and ground based imaging arrays

Author

Yates, S.J.C., Baselmans, J.J.A., Baryshev, A.M., Neto, A., Gerini, G., Barends, R., Lankwarden, Y.J.Y., and TNO Defensie en Veiligheid

Abstract

Very large arrays of Microwave Kinetic Inductance Detectors (MKIDs) have the potential to revolutionize ground and space based astronomy. They can offer in excess of 10000 pixels with large dynamic range and very high sensitivity in combination with very efficient frequency division multiplexing at GHz frequencies. In this paper we present the development for a ∼ 100 pixel MKID demonstration array based upon an single pixel consisting of an integrated MKID-antenna detector, with the antenna placed in the second focus of an elliptical Si lens. The design presented can be scaled to any frequency between 80 GHz and >5 THz because there is no need for superconducting structures that become lossy at frequencies above the gap frequency of the materials used. We present measurements of the optical coupling efficiency, sensitivity and discuss array development. We have obtained a dark sensitivity of 7 × 10-19 W/Hz1/2 using 100 nm thick Al devices and an optical coupling efficiency of 35 % referring to the power of a single polarization optical signal in front of the Si lens of the detector. © 2009 American Institute of Physics.

Published
2009

105. Improved superconducting hot-electron bolometer devices for the THz range

Author

Klapwijk, T.M., Barends, R., Gao, J.R., Hajenius, M., and Baselmans, J.J.A.

Subjects
terahertz, Condensed Matter::Superconductivity, heterodyne mixing, hot electrons
Abstract

Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical conditions during the mixing process. We find that the mixing is predominantly due to the exponential rise of the local resistivity as a function of electron temperature.

Published
2004

106. Compressed sensing quantum process tomography for superconducting quantum gates

Author

Rodionov, Andrey V, Rodionov, Andrey V, Veitia, Andrzej, Barends, R, Kelly, J, Sank, Daniel, Wenner, J, Martinis, John M, Kosut, Robert L, Korotkov, Alexander N, Rodionov, Andrey V, Rodionov, Andrey V, Veitia, Andrzej, Barends, R, Kelly, J, Sank, Daniel, Wenner, J, Martinis, John M, Kosut, Robert L, and Korotkov, Alexander N

Published
2014

107. Qubit Architecture with High Coherence and Fast Tunable Coupling

Author

Chen, Yu, primary, Neill, C., additional, Roushan, P., additional, Leung, N., additional, Fang, M., additional, Barends, R., additional, Kelly, J., additional, Campbell, B., additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Jeffrey, E., additional, Megrant, A., additional, Mutus, J. Y., additional, O’Malley, P. J. J., additional, Quintana, C. M., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Geller, Michael R., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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108. Observation of topological transitions in interacting quantum circuits

Author

Roushan, P., primary, Neill, C., additional, Chen, Yu, additional, Kolodrubetz, M., additional, Quintana, C., additional, Leung, N., additional, Fang, M., additional, Barends, R., additional, Campbell, B., additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Jeffrey, E., additional, Kelly, J., additional, Megrant, A., additional, Mutus, J., additional, O’Malley, P. J. J., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T., additional, Polkovnikov, A., additional, Cleland, A. N., additional, and Martinis, J. M., additional

Published
2014
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109. Emulating weak localization using a solid-state quantum circuit

Author

Chen, Yu, primary, Roushan, P., additional, Sank, D., additional, Neill, C., additional, Lucero, Erik, additional, Mariantoni, Matteo, additional, Barends, R., additional, Chiaro, B., additional, Kelly, J., additional, Megrant, A., additional, Mutus, J. Y., additional, O'Malley, P. J. J., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Yin, Yi, additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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110. Characterization and reduction of microfabrication-induced decoherence in superconducting quantum circuits

Author

Quintana, C. M., primary, Megrant, A., additional, Chen, Z., additional, Dunsworth, A., additional, Chiaro, B., additional, Barends, R., additional, Campbell, B., additional, Chen, Yu, additional, Hoi, I.-C., additional, Jeffrey, E., additional, Kelly, J., additional, Mutus, J. Y., additional, O'Malley, P. J. J., additional, Neill, C., additional, Roushan, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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111. Strong environmental coupling in a Josephson parametric amplifier

Author

Mutus, J. Y., primary, White, T. C., additional, Barends, R., additional, Chen, Yu, additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Jeffrey, E., additional, Kelly, J., additional, Megrant, A., additional, Neill, C., additional, O'Malley, P. J. J., additional, Roushan, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, Sundqvist, K. M., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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112. Optimal Quantum Control Using Randomized Benchmarking

Author

Kelly, J., primary, Barends, R., additional, Campbell, B., additional, Chen, Y., additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Fowler, A. G., additional, Hoi, I.-C., additional, Jeffrey, E., additional, Megrant, A., additional, Mutus, J., additional, Neill, C., additional, O’Malley, P. J. J., additional, Quintana, C., additional, Roushan, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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113. Fast Accurate State Measurement with Superconducting Qubits

Author

Jeffrey, Evan, primary, Sank, Daniel, additional, Mutus, J. Y., additional, White, T. C., additional, Kelly, J., additional, Barends, R., additional, Chen, Y., additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Megrant, A., additional, O’Malley, P. J. J., additional, Neill, C., additional, Roushan, P., additional, Vainsencher, A., additional, Wenner, J., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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115. Power handling and responsivity of submicron wide superconducting coplanar waveguide resonators

Author

Janssen, R.M.J. (author), Endo, A. (author), Baselmans, J.J.A. (author), De Visser, P.J. (author), Barends, R. (author), Klapwijk, T.M. (author), Janssen, R.M.J. (author), Endo, A. (author), Baselmans, J.J.A. (author), De Visser, P.J. (author), Barends, R. (author), and Klapwijk, T.M. (author)

Abstract

The sensitivity of microwave kinetic inductance detectors (MKIDs) based on coplanar waveguides (CPWs) needs to be improved by at least an order of magnitude to satisfy the requirements for space-based terahertz astronomy. Our aim is to investigate if this can be achieved by reducing the width of the CPW to much below what has typically been made using optical lithography (> 1 ?m). CPW resonators with a central line width as narrow as 300 nm were made in NbTiN using electron beam lithography and reactive ion etching. In a systematic study of quarter-wave CPW resonators with varying widths it is shown that the behavior of responsivity, noise and power handling as a function of width continues down to 300 nm. This encourages the development of narrow KIDs using Al in order to improve their sensitivity., Kavli Institute of NanoScience, Applied Sciences

Published
2012
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116. Substrate-dependent quasiparticle recombination time in superconducting resonators

Author

Vercruyssen, N. (author), Barends, R. (author), Klapwijk, T.M. (author), Muhonen, J.T. (author), Meschke, M. (author), Pekola, J.P. (author), Vercruyssen, N. (author), Barends, R. (author), Klapwijk, T.M. (author), Muhonen, J.T. (author), Meschke, M. (author), and Pekola, J.P. (author)

Abstract

We demonstrate an increased quasiparticle recombination time in superconducting resonators on a SiNx membrane, compared to identical resonators on a SiNx/Si wafer. An interpretation is given using a thermal model of the membrane. Using an array of tunnel junctions to cool or heat the membrane, we show that the resonators on the membranes are extremely sensitive to small changes of the phonon temperature, which renders them excellent phonon thermometers with a noise level equivalent to 5?K/?Hz. The experimental set-up is in principle an ideal platform to study the interplay of quasiparticles and phonon populations in superconductors., QN/Quantum Nanoscience, Applied Sciences

Published
2011
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117. Reduced frequency noise in superconducting resonators

Author

Barends, R. (author), Vercruyssen, N. (author), Endo, A. (author), De Visser, P.J. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author), Barends, R. (author), Vercruyssen, N. (author), Endo, A. (author), De Visser, P.J. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), and Baselmans, J.J.A. (author)

Abstract

We report a reduction in the frequency noise in coplanar waveguide superconducting resonators. The reduction of 7 dB is achieved by removing the exposed dielectric substrate surface from the region with high electric fields and by using NbTiN. In a model-analysis the surface of NbTiN is found to be a negligible source of noise, experimentally supported by a comparison with NbTiN on SiOx resonators. The reduction is additive to decreasing the noise by widening the resonators., Kavli Institute of Nanoscience, Applied Sciences

Published
2010
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118. Minimal resonator loss for circuit quantum electrodynamics

Author

Barends, R. (author), Vercruyssen, N. (author), Endo, A. (author), De Visser, P.J. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), Diener, P. (author), Yates, S.J.C. (author), Baselmans, J.J.A. (author), Barends, R. (author), Vercruyssen, N. (author), Endo, A. (author), De Visser, P.J. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), Diener, P. (author), Yates, S.J.C. (author), and Baselmans, J.J.A. (author)

Abstract

We report quality factors of up to 500x10³ in superconducting resonators at the single photon levels needed for circuit quantum electrodynamics. This result is achieved by using NbTiN and removing the dielectric from regions with high electric fields. As demonstrated by a comparison with Ta, the crucial sources of intensity-dependent loss are dielectrics on the surface of the metal and substrate., Kavli Institute of Nanoscience, Applied Sciences

Published
2010
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119. Quantum noise in a terahertz hot electron bolometer mixer

Author

Zhang, W. (author), Khosropanah, P. (author), Gao, J.R. (author), Kollberg, E.L. (author), Yngvesson, K.S. (author), Bansal, T. (author), Barends, R. (author), Klapwijk, T.M. (author), Zhang, W. (author), Khosropanah, P. (author), Gao, J.R. (author), Kollberg, E.L. (author), Yngvesson, K.S. (author), Bansal, T. (author), Barends, R. (author), and Klapwijk, T.M. (author)

Abstract

We have measured the noise temperature of a single, sensitive superconducting NbN hot electron bolometer (HEB) mixer in a frequency range from 1.6 to 5.3 THz, using a setup with all the key components in vacuum. By analyzing the measured receiver noise temperature using a quantum noise (QN) model for HEB mixers, we confirm the effect of QN. The QN is found to be responsible for about half of the receiver noise at the highest frequency in our measurements. The ?-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value., Kavli Institute of Nanoscience, Applied Sciences

Published
2010
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120. Photon-detecting superconducting resonators

Author

Barends, R. (author) and Barends, R. (author)

Abstract

One of the greatest challenges in astronomy is observing star and planetary formation, redshifted distant galaxies and molecular spectral ‘fingerprints’ in the far-infrared spectrum of light, using highly sensitive and large cameras. In this thesis we investigate superconducting resonators for photon detection. In superconductors the electrons are paired. The incoming light then breaks these pairs into unpaired electrons, so-called quasiparticles, influencing the superconductor’s inductance. Consequently, the resonance frequency shifts. These resonators are extremely sensitive, since they are operated at temperatures where less than a billionth of the electrons are unpaired. By giving each resonator (or pixel) a slightly different length, like the pipes in an organ, many can be read out simultaneously. This allows for the construction of large cameras. These cameras work best when pairing is slow – the quasiparticles eventually recombine and the signal is lost – and the noise is low. In this thesis we focus on two main topics: the quasiparticle recombination process as well as the frequency noise of these resonators. At low temperatures we find relaxation times as long as milliseconds for Al and several tens of microseconds for Ta. The relaxation times clearly saturate at low temperatures in both materials, indicating an additional recombination channel in the superconducting films. The low temperature relaxation is made faster by the implantation of magnetic as well as nonmagnetic atoms, indicating that it arises from an enhancement of disorder. In addition, we show that the frequency noise mainly arises at interfaces, whereas deviations in the temperature dependence of the resonance frequency arise from dipole defects in the volume of dielectrics. Finally, we significantly decrease the noise by widening the geometry of the resonator waveguide., Kavli Institute of NanoScience, Applied Sciences

Published
2009

121. Quasiparticle relaxation in high Q superconducting resonators

Author

Barends, R. (author), Van Vliet, S. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Barends, R. (author), Van Vliet, S. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), and Klapwijk, T.M. (author)

Abstract

We present measurements of the quasiparticle relaxation time in Ta superconducting films shaped as planar resonators using the response of the complex conductivity to photon flux. These films have been implanted with magnetic (Mn) as well as non-magnetic atoms (Al). We find a significant decrease of the relaxation time with increasing impurity concentration for both cases, observing a reduction of the low temperature relaxation time, from 25 µs to 10 µs when implanting 100 ppm Mn. This indicates that impurities enhance quasiparticle relaxation in superconductors, regardless of their magnetic moment., Kavli Institute of Nanoscience, Applied Sciences

Published
2009
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122. Enhancement of quasiparticle recombination in Ta and Al superconductors by implantation of magnetic and nonmagnetic atoms

Author

Barends, R. (author), Van Vliet, S. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Barends, R. (author), Van Vliet, S. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), and Klapwijk, T.M. (author)

Abstract

The quasiparticle recombination time in superconducting films, consisting of the standard electron-phonon interaction and a yet to be identified low-temperature process, is studied for different densities of magnetic and nonmagnetic atoms. For both Ta and Al, implanted with Mn, Ta, and Al, we observe an increase in the recombination rate. We conclude that the enhancement of recombination is not due to the magnetic moment, but arises from an enhancement of disorder., Kavli Institute of Nanoscience, Applied Sciences

Published
2009
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123. Noise in NbTiN, Al, and Ta Superconducting Resonators on Silicon and Sapphire Substrates

Author

Barends, R. (author), Hortensius, H.L. (author), Zijlstra, T. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Barends, R. (author), Hortensius, H.L. (author), Zijlstra, T. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), and Klapwijk, T.M. (author)

Abstract

We present measurements of the frequency noise and resonance frequency temperature dependence in planar superconducting resonators on both silicon and sapphire substrates. We show, by covering the resonators with sputtered SiOx layers of different thicknesses, that the temperature dependence of the resonance frequency scales linearly with thickness, whereas the observed increase in noise is independent of thickness. The frequency noise decreases when increasing the width of the coplanar waveguide in NbTiN on hydrogen passivated silicon devices, most effectively by widening the gap. We find up to an order of magnitude more noise when using sapphire instead of silicon as substrate. The complete set of data points towards the noise being strongly affected by superconductor-dielectric interfaces., Kavli Institute of Nanosciences, Applied Sciences

Published
2009
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124. Fabrication and characterization of aluminum airbridges for superconducting microwave circuits

Author

Chen, Zijun, primary, Megrant, A., additional, Kelly, J., additional, Barends, R., additional, Bochmann, J., additional, Chen, Yu, additional, Chiaro, B., additional, Dunsworth, A., additional, Jeffrey, E., additional, Mutus, J. Y., additional, O'Malley, P. J. J., additional, Neill, C., additional, Roushan, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2014
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125. Contribution of dielectrics to frequency and noise of NbTiN superconducting resonators

Author

Barends, R. (author), Hortensius, H.L. (author), Zijlstra, T. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Barends, R. (author), Hortensius, H.L. (author), Zijlstra, T. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), and Klapwijk, T.M. (author)

Abstract

We study NbTiN resonators by measurements of the temperature dependent resonance frequency and frequency noise. Additionally, resonators are studied covered with SiOx dielectric layers of various thicknesses. The resonance frequency develops a nonmonotonic temperature dependence with increasing SiOx layer thickness. The increase in the noise is independent of the SiOx thickness, demonstrating that the noise is not dominantly related to the low temperature resonance frequency deviations., Kavli Institute of Nanoscience, Applied Sciences

Published
2008
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126. Quasiparticle Relaxation in Optically Excited High-Q Superconducting Resonators

Author

Barends, R. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Hovenier, J.N. (author), Klapwijk, T.M. (author), Barends, R. (author), Baselmans, J.J.A. (author), Yates, S.J.C. (author), Gao, J.R. (author), Hovenier, J.N. (author), and Klapwijk, T.M. (author)

Abstract

The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminum, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interaction. At low temperatures we find in both superconducting materials a saturation of the relaxation time, suggesting the presence of a second relaxation channel not due to electron-phonon interaction., Kavli Institute of Nanoscience, Applied Sciences

Published
2008

127. Room temperature deposition of sputtered TiN films for superconducting coplanar waveguide resonators

Author

Ohya, S, primary, Chiaro, B, additional, Megrant, A, additional, Neill, C, additional, Barends, R, additional, Chen, Y, additional, Kelly, J, additional, Low, D, additional, Mutus, J, additional, O’Malley, P J J, additional, Roushan, P, additional, Sank, D, additional, Vainsencher, A, additional, Wenner, J, additional, White, T C, additional, Yin, Y, additional, Schultz, B D, additional, Palmstrøm, C J, additional, Mazin, B A, additional, Cleland, A N, additional, and Martinis, John M, additional

Published
2013
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128. Design and characterization of a lumped element single-ended superconducting microwave parametric amplifier with on-chip flux bias line

Author

Mutus, J. Y., primary, White, T. C., additional, Jeffrey, E., additional, Sank, D., additional, Barends, R., additional, Bochmann, J., additional, Chen, Yu, additional, Chen, Z., additional, Chiaro, B., additional, Dunsworth, A., additional, Kelly, J., additional, Megrant, A., additional, Neill, C., additional, O'Malley, P. J. J., additional, Roushan, P., additional, Vainsencher, A., additional, Wenner, J., additional, Siddiqi, I., additional, Vijay, R., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2013
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129. Coherent Josephson Qubit Suitable for Scalable Quantum Integrated Circuits

Author

Barends, R., primary, Kelly, J., additional, Megrant, A., additional, Sank, D., additional, Jeffrey, E., additional, Chen, Y., additional, Yin, Y., additional, Chiaro, B., additional, Mutus, J., additional, Neill, C., additional, O’Malley, P., additional, Roushan, P., additional, Wenner, J., additional, White, T. C., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2013
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130. Fluctuations from edge defects in superconducting resonators

Author

Neill, C., primary, Megrant, A., additional, Barends, R., additional, Chen, Yu, additional, Chiaro, B., additional, Kelly, J., additional, Mutus, J. Y., additional, O'Malley, P. J. J., additional, Sank, D., additional, Wenner, J., additional, White, T. C., additional, Yin, Yi, additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2013
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131. Excitation of Superconducting Qubits from Hot Nonequilibrium Quasiparticles

Author

Wenner, J., primary, Yin, Yi, additional, Lucero, Erik, additional, Barends, R., additional, Chen, Yu, additional, Chiaro, B., additional, Kelly, J., additional, Lenander, M., additional, Mariantoni, Matteo, additional, Megrant, A., additional, Neill, C., additional, O’Malley, P. J. J., additional, Sank, D., additional, Vainsencher, A., additional, Wang, H., additional, White, T. C., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2013
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132. Catch and Release of Microwave Photon States

Author

Yin, Yi, primary, Chen, Yu, additional, Sank, Daniel, additional, O’Malley, P. J. J., additional, White, T. C., additional, Barends, R., additional, Kelly, J., additional, Lucero, Erik, additional, Mariantoni, Matteo, additional, Megrant, A., additional, Neill, C., additional, Vainsencher, A., additional, Wenner, J., additional, Korotkov, Alexander N., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2013
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133. Current-induced vortex unbinding in bolometer mixers

Author

Barends, R. (author), Hajenius, M. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Barends, R. (author), Hajenius, M. (author), Gao, J.R. (author), and Klapwijk, T.M. (author)

Abstract

We present a description of the current-voltage characteristics of hot electron bolometers in terms of the current-dependent intrinsic resistive transition of NbN films. We find that, by including this current dependence, we can correctly predict the complete current-voltage characteristics, showing excellent agreement with measurements for both low and high bias and for small as well as large devices. It is assumed that the current dependence is due to vortex-antivortex unbinding as described in the Berezinskii–Kosterlitz–Thouless theory. The presented approach will be useful in guiding device optimization for noise and bandwidth., Kavli Institute of Nanoscience, Applied Sciences

Published
2005
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134. Multiplexed dispersive readout of superconducting phase qubits

Author

Chen, Yu, primary, Sank, D., additional, O'Malley, P., additional, White, T., additional, Barends, R., additional, Chiaro, B., additional, Kelly, J., additional, Lucero, E., additional, Mariantoni, M., additional, Megrant, A., additional, Neill, C., additional, Vainsencher, A., additional, Wenner, J., additional, Yin, Y., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2012
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135. Computing prime factors with a Josephson phase qubit quantum processor

Author

Lucero, Erik, primary, Barends, R., additional, Chen, Y., additional, Kelly, J., additional, Mariantoni, M., additional, Megrant, A., additional, O’Malley, P., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T., additional, Yin, Y., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2012
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136. Flux Noise Probed with Real Time Qubit Tomography in a Josephson Phase Qubit

Author

Sank, Daniel, primary, Barends, R., additional, Bialczak, Radoslaw C., additional, Chen, Yu, additional, Kelly, J., additional, Lenander, M., additional, Lucero, E., additional, Mariantoni, Matteo, additional, Megrant, A., additional, Neeley, M., additional, O’Malley, P. J. J., additional, Vainsencher, A., additional, Wang, H., additional, Wenner, J., additional, White, T. C., additional, Yamamoto, T., additional, Yin, Yi, additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2012
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138. Planar superconducting resonators with internal quality factors above one million

Author

Megrant, A., primary, Neill, C., additional, Barends, R., additional, Chiaro, B., additional, Chen, Yu, additional, Feigl, L., additional, Kelly, J., additional, Lucero, Erik, additional, Mariantoni, Matteo, additional, O’Malley, P. J. J., additional, Sank, D., additional, Vainsencher, A., additional, Wenner, J., additional, White, T. C., additional, Yin, Y., additional, Zhao, J., additional, Palmstrøm, C. J., additional, Martinis, John M., additional, and Cleland, A. N., additional

Published
2012
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139. Dynamic quantum Kerr effect in circuit quantum electrodynamics

Author

Yin, Yi, primary, Wang, H., additional, Mariantoni, M., additional, Bialczak, Radoslaw C., additional, Barends, R., additional, Chen, Y., additional, Lenander, M., additional, Lucero, Erik, additional, Neeley, M., additional, O'Connell, A. D., additional, Sank, D., additional, Weides, M., additional, Wenner, J., additional, Yamamoto, T., additional, Zhao, J., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2012
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141. Improved superconducting hot-electron bolometer devices for the THz range

Author

Klapwijk, T.M. (author), Barends, R. (author), Gao, J.R. (author), Hajenius, M. (author), Baselmans, J.J.A. (author), Klapwijk, T.M. (author), Barends, R. (author), Gao, J.R. (author), Hajenius, M. (author), and Baselmans, J.J.A. (author)

Abstract

Improved and reproducible heterodyne mixing (noise temperatures of 950 K at 2.5 THz) has been realized with NbN based hot-electron superconducting devices with low contact resistances. A distributed temperature numerical model of the NbN bridge, based on a local electron and a phonon temperature, has been used to understand the physical conditions during the mixing process. We find that the mixing is predominantly due to the exponential rise of the local resistivity as a function of electron temperature., Kavli Institute of Nanoscience, Applied Sciences

Published
2004

142. Minimizing quasiparticle generation from stray infrared light in superconducting quantum circuits

Author

Barends, R., primary, Wenner, J., additional, Lenander, M., additional, Chen, Y., additional, Bialczak, R. C., additional, Kelly, J., additional, Lucero, E., additional, O’Malley, P., additional, Mariantoni, M., additional, Sank, D., additional, Wang, H., additional, White, T. C., additional, Yin, Y., additional, Zhao, J., additional, Cleland, A. N., additional, Martinis, John M., additional, and Baselmans, J. J. A., additional

Published
2011
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143. Surface loss simulations of superconducting coplanar waveguide resonators

Author

Wenner, J., primary, Barends, R., additional, Bialczak, R. C., additional, Chen, Yu, additional, Kelly, J., additional, Lucero, Erik, additional, Mariantoni, Matteo, additional, Megrant, A., additional, O’Malley, P. J. J., additional, Sank, D., additional, Vainsencher, A., additional, Wang, H., additional, White, T. C., additional, Yin, Y., additional, Zhao, J., additional, Cleland, A. N., additional, and Martinis, John M., additional

Published
2011
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