Optimal operation of a Josephson parametric amplifier for vacuum squeezing
M. Malnou, D. A. Palken, Leila R. Vale, Gene C. Hilton, K. W. Lehnert
TL;DR
This paper demonstrates how optimizing pump power in a Josephson parametric amplifier enhances vacuum squeezing, achieving nearly 4 dB of noise reduction by reducing amplifier distortion.
Contribution
It provides experimental evidence that operating the JPA above maximum gain point reduces distortion and improves vacuum squeezing performance.
Findings
Achieved 3.87 dB of vacuum squeezing.
Operating above maximum gain reduces amplifier distortion.
Optimized pump power enhances squeezing quality.
Abstract
A Josephson parametric amplifier (JPA) can create squeezed states of microwave light, lowering the noise associated with certain quantum measurements. We experimentally study how the JPA's pump influences the phase-sensitive amplification and deamplification of a coherent tone's amplitude when that amplitude is commensurate with vacuum fluctuations. We predict and demonstrate that by operating the JPA with a pump power greater than the value that maximizes gain, the amplifier distortion is reduced and consequently squeezing is improved. Optimizing the JPA's operation in this fashion, we directly observe dB of vacuum squeezing.
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