Simulation and Analysis of Superconducting Traveling-Wave Parametric Amplifiers

Superconducting parametric amplifiers have great promise for quantum-limited readout of superconducting qubits and detectors. Until recently, most superconducting parametric amplifiers had been based on resonant structures, limiting their bandwidth and dynamic range. Broadband traveling-wave paramet...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2015-06, Vol.25 (3), p.1-5
Main Authors: Chaudhuri, Saptarshi, Jiansong Gao, Irwin, Kent
Format: Article
Language:English
Subjects:
Amplitude modulation
Computational modeling
Dispersion
Gain
Harmonic analysis
Josephson junctions
Mathematical model
Microwave parametric amplifiers
superconducting detector readout
superconducting quantum measurement
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Summary:Superconducting parametric amplifiers have great promise for quantum-limited readout of superconducting qubits and detectors. Until recently, most superconducting parametric amplifiers had been based on resonant structures, limiting their bandwidth and dynamic range. Broadband traveling-wave parametric amplifiers based both on the nonlinear kinetic inductance of superconducting thin films and on Josephson junctions are in development. By modifying the dispersion property of the amplifier circuit, referred to as dispersion engineering, the gain can be greatly enhanced and the size can be reduced. We present two theoretical frameworks for analyzing and understanding such parametric amplifiers: 1) generalized coupled-mode equations and 2) a finite difference time domain (FDTD) model combined with a small signal analysis. We show how these analytical and numerical tools may be used to understand device performance.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2014.2378059