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Superconducting quantum interference device as a near-quantum-limited amplifier for the axion dark-matter experiment

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2 Author(s)
Kinion, D. ; Lawrence Livermore National Laboratory, Livermore, California 94550, USA ; Clarke, John

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We characterized a microstrip superconducting quantum interference device amplifier (MSA) as a function of frequency and temperature. At 40 mK, with optimal current and flux biases, the maximum gain of 20.4 dB was at 620 MHz; the bandwidth was 21 MHz. The minimum noise temperature TN=48±5 mK occurred at 612 MHz, slightly below the frequency of maximum gain. This value of TN is within a factor of 1.6 of the quantum limit TQ=hf/kB (f is frequency) for a linear, phase-preserving amplifier. Incorporating the MSA into the axion detector at the University of Washington will increase the scan rate by two to three orders of magnitude.

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Applied Physics Letters  (Volume:98 ,  Issue: 20 )