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Title: Strong environmental coupling in a Josephson parametric amplifier

We present a lumped-element Josephson parametric amplifier designed to operate with strong coupling to the environment. In this regime, we observe broadband frequency dependent amplification with multi-peaked gain profiles. We account for this behavior using the “pumpistor” model which allows for frequency dependent variation of the external impedance. Using this understanding, we demonstrate control over the complexity of gain profiles through added variation in the environment impedance at a given frequency. With strong coupling to a suitable external impedance, we observe a significant increase in dynamic range, and large amplification bandwidth up to 700 MHz giving near quantum-limited performance.
Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Department of Physics, University of California, Santa Barbara, California 93106-9530 (United States)
  2. (United States)
  3. Department of Electrical and Computer Engineering, Texas A and M University, College Station, Texas 77843 (United States)
Publication Date:
OSTI Identifier:
22303915
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONTROL; COUPLING; FREQUENCY DEPENDENCE; GAIN; IMPEDANCE; MHZ RANGE; PARAMETRIC AMPLIFIERS; STRONG-COUPLING MODEL