A three-dimensional Josephson parametric amplifier
I. Mahboob, H. Toida, K. Kakuyanagi, Y. Nakamura, S. Saito
TL;DR
This paper presents a novel three-dimensional Josephson parametric amplifier (JPA) using a 3D microwave cavity coupled with a SQUID, achieving high gain and low noise for quantum signal amplification.
Contribution
It introduces a 3D cavity-based JPA activated via three-wave mixing, demonstrating high gain and low noise performance in a new configuration.
Findings
Gain exceeds 40 dB at 8.3 GHz
Operational bandwidth of 0.4 MHz at 20 dB gain
Added noise is approximately half a quantum
Abstract
A Josephson parametric amplifier (JPA) is executed in a three-dimensional (3D) microwave cavity by coupling it to a superconducting quantum interference device (SQUID) that is embedded in a two-dimensional resonator. The JPA is activated in a three-wave mixing configuration by injecting ac magnetic flux, at twice the 3D cavity frequency, into the SQUID. An 8.3 GHz cavity is measured in a non-degenerate phase-insensitive configuration which yields gains in excess of 40 dB, where a 20 dB gain results in an operational bandwidth of 0.4 MHz, a 1 dB compression point of -115 dBm with half a quantum of added noise.
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