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Noise performance of lumped element direct current superconducting quantum interference device amplifiers in the 4–8 GHz range

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4 Author(s)
Spietz, L. ; National Institute of Standards and Technology, Boulder, Colorado 80305, USA ; Irwin, K. ; Lee, Minhyea ; Aumentado, Jose

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We report on the noise of a lumped element direct current superconducting quantum interference device amplifier. We show that the noise temperature in the 4–8 GHz range over ranges of tens of megahertz is below 1 K (three photons of added noise), characterize the overall behavior of the noise as a function of bias parameters, and discuss potential mechanisms which determine the noise performance in this amplifier. We show that this device can provide more than a factor of 10 improvement in practical system noise over existing phase-preserving microwave measurement systems in this frequency band.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 14 )