Optimal operation of a Josephson parametric amplifier for vacuum squeezing
arXiv:1711.02786 · doi:10.1103/PhysRevApplied.9.044023
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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