Simulation and analysis of superconducting traveling-wave parametric amplifiers

Saptarshi Chaudhuri, Jiansong Gao, Kent Irwin

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Original languageEnglish (US)
Article number6975043
JournalIEEE Transactions on Applied Superconductivity
Issue number3
StatePublished - Jun 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Microwave parametric amplifiers
  • superconducting detector readout
  • superconducting quantum measurement


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