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Observation of parametric deamplification in a Josephson parametric amplifier.

01 January 1989

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As a first step in an effort to generate squeezed microwave radiation, we have measured the phase sensitive gain of a Josephson parametric amplifier. We have observed parametric deamplification of signals by more than 8 db. Our observations indicate that the device is a promising candidate for the generation of squeezed microwaves. In order to facilitate the interpretation of the data, a discussion of the theory of microwave squeezing via Josephson parametric amplifiers is also presented here.