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Simulation and Analysis of Superconducting Traveling-Wave Parametric Amplifiers
Saptarshi Chaudhuri, Jiansong Gao, Kent Irwin
Superconducting parametric amplifiers have great promise for quantum-limited readout of superconducting qubits and detectors. Until recently, most superconducting parametric amplif…
Current distribution and transition width in superconducting transition-edge sensors
D. S. Swetz, D. A. Bennett, K. D. Irwin +2
Present models of the superconducting-to-normal transition in transition-edge sensors (TESs) do not describe the current distribution within a biased TES. This distribution is comp…
Proximity-Coupled Ti/TiN Multilayers for use in Kinetic Inductance Detectors
Michael R. Vissers, Jiansong Gao, Martin Sandberg +4
We apply the superconducting proximity effect in TiN/Ti multi-layer films to tune the critical temperature, Tc, to within 10 mK with high uniformity (less than 15 mK spread) across…
Noise Performance of Lumped Element Direct Current Superconducting Quantum Interference Device Amplifiers in the 4 GHz-8 GHz Range
Lafe Spietz, Kent Irwin, Minhyea Lee +1
We report on the noise of a lumped element Direct Current Superconducting Quantum Interference Device amplifier. We show that the noise temperature in the 4 GHz-8 GHz range over ra…
Strongly quadrature-dependent noise in superconducting micro-resonators measured at the vacuum-noise limit
J. Gao, L. R. Vale, J. A. B. Mates +8
We measure frequency- and dissipation-quadrature noise in superconducting lithographed microwave resonators with sensitivity near the vacuum noise level using a Josephson parametri…
Superconducting Quantum Interference Device Amplifiers with over 27 GHz of Gain-Bandwidth Product Operated in the 4 GHz--8 GHz Frequency Range
Lafe Spietz, Kent Irwin, Jose Aumentado
We describe the performance of amplifiers in the 4 GHz--8 GHz range using Direct Current Superconducting Quantum Interference Devices(DC SQUIDs) in a lumped element configuration.…