Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-23
Physics
Condensed Matter
Superconductivity
Scientific paper
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 GHz-8 GHz range over ranges of 10's of MHz is below 1 kelvin (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.
Aumentado José
Irwin Kent
Lee Minhyea
Spietz Lafe
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