Squeezing Thermal Microwave Radiation

  • B. Yurke
  • P. G. Kaminsky
  • E. A. Whittaker
  • A. D. Smith
  • A. H. Silver
  • R. W. Simon
Part of the NATO ASI Series book series (NSSB, volume 190)


We have demonstrated squeezing of 4.2 K thermal noise using a Josephson-parametric amplifier operated at 19.4 GHz. A 42% reduction in the equilibrium noise was observed. When operated at 0.1K, the amplifier exhibited an excess noise of 0.28 K referred to the amplifier’s input. This excess noise is less than the vacuum fluctuation noise at the input. The device can be operated in a nonchaotic mode with a signal gain of 9 dB.


Pump Power Josephson Junction Reflection Loss Excess Noise Parametric Gain 


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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • B. Yurke
    • 1
  • P. G. Kaminsky
    • 1
  • E. A. Whittaker
    • 2
  • A. D. Smith
    • 3
  • A. H. Silver
    • 3
  • R. W. Simon
    • 3
  1. 1.AT&T Bell LaboratoriesMurray HillUSA
  2. 2.Stevens Institute of TechnologyHobokenUSA
  3. 3.TRW Space & Technology GroupRedondo BeachUSA

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