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Strong environmental coupling in a Josephson parametric amplifier

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arxiv 1401.3799 v2 pith:2QPTHFX7 submitted 2014-01-16 cond-mat.supr-con

Strong environmental coupling in a Josephson parametric amplifier

Josh Mutus , Ted White , Rami Barends , Yu Chen , Zijun Chen , Ben Chiaro , Andrew Dunsworth , Evan Jeffrey
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Julian Kelly Anthony Megrant Charles Neill Peter O'Malley Pedram Roushan Daniel Sank Amit Vainsencher James Wenner Kyle Sundqvist Andrew Cleland John Martinis
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classification cond-mat.supr-con
keywords couplingfrequencyimpedancestrongamplificationamplifierdependentenvironment
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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 behaviour using the "pumpistor" model which allows for frequency dependent variation of the external impedance. Using this understanding, we demonstrate control over gain profiles through changes 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.

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