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Optimal operation of a Josephson parametric amplifier for vacuum squeezing
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Optimal operation of a Josephson parametric amplifier for vacuum squeezing
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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 $3.87 \pm 0.03$ dB of vacuum squeezing.
Forward citations
Cited by 2 Pith papers
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Practical Limits to Single-Mode Vacuum Squeezing with a SNAIL Parametric Amplifier
In practical SNAIL parametric amplifiers, achievable vacuum squeezing is limited by internal resonator loss and microwave chain insertion loss rather than Kerr nonlinearity.
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Practical Limits to Single-Mode Vacuum Squeezing with a SNAIL Parametric Amplifier
Experimental tests show achievable vacuum squeezing in practical SNAIL parametric amplifiers depends little on Kerr strength and is instead set by internal resonator loss plus microwave chain insertion loss.
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