Title :
Vacuum noise squeezing at microwave frequencies using a Josephson parametric amplifier
Author :
Movshovich, R. ; Yurke, B. ; Kaminsky, P.G. ; Smith, A.D. ; Silver, A.H. ; Simon, R.W.
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
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
Keywords :
electron device noise; microwave parametric amplifiers; solid-state microwave devices; 19.16 GHz; 30 mK; Josephson parametric amplifier; dilution refrigerator; double-sideband noise temperature; microwave frequencies; microwave noise; noise temperature; squeezed microwave radiation; vacuum fluctuations; vacuum noise level; vacuum noise squeezing; Detectors; Fluctuations; Microwave amplifiers; Microwave frequencies; Noise level; Noise measurement; Optical amplifiers; Refrigeration; Switches; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
