Strong environmental coupling in a Josephson parametric amplifier
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 30, 2014
- Source ID
- 10.1063/1.4886408
Entities
People
- A. Dunsworth
- A. Megrant
- A. N. Cleland
- A. Vainsencher
- B. Chiaro
- Charles Neill
- D. Sank
- E. Jeffrey
- J. Y. Mutus
- James F. Kelly
- James Wenner
- John M. Martinis
- K. M. Sundqvist
- P. J. J. O'malley
- P. Roushan
- R. Barends
- T. C. White
- Yu Chen
- Zexun Chen
Organizations
- Army Research Office
- Texas A&M University
- University of California