Josephson traveling-wave parametric amplifier with three-wave mixing

A. B. Zorin

doi:10.1103/PhysRevApplied.6.034006

paper

Josephson traveling-wave parametric amplifier with three-wave mixing

arXiv:1602.02650 · doi:10.1103/PhysRevApplied.6.034006

Abstract

We develop a concept of the traveling-wave Josephson parametric amplifier exploiting quadratic nonlinearity of a serial array of one-junction SQUIDs embedded in a superconducting transmission line. The external magnetic flux applied to the SQUIDs makes it possible to efficiently control the shape of their current-phase relation and, hence, the balance between quadratic and cubic (Kerr-like) nonlinearities. This property allows us to operate in the favorable three-wave-mixing mode with minimal phase mismatch, an exponential dependence of the power gain on number of sections $N$ , a large bandwidth, a high dynamic range, and substantially separated signal ( $f_{s}$ ) and pump ( $f_{p}$ ) frequencies obeying relation $f_{s} + f_{i} = f_{p}$ , where $f_{i}$ is the idler frequency. An estimation of the amplifier characteristics with typical experimental parameters, a pump frequency of $12$ GHz, and $N = 300$ yields a flat gain of 20 dB in the bandwidth of 5.6 GHz.

Josephson traveling-wave parametric amplifier with three-wave mixing

Abstract

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