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Vacuum noise squeezing at microwave frequencies using a Josephson parametric amplifier

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6 Author(s)
Movshovich, R. ; AT&T Bell Labs., Murray Hill, NJ, USA ; Yurke, B. ; Kaminsky, P. ; Smith, A.D.
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Experiments on generating squeezed microwave radiation at 19.16 GHz using a Josephson parametric amplifier were performed. The source of the radiation was cooled by a dilution refrigerator down to the lowest temperature of 0.030 K. At this temperature, noise at the input port of the parametric amplifier consists almost entirely of the vacuum fluctuations with a noise temperature hν/2k of 0.46 K. The authors observed the squeezing of the microwave noise by 47±8% as referred to the input of the Josephson parametric amplifier. The measured double-sideband noise temperature of the amplifier is 0.446 K, which is comparable to the vacuum noise level

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )