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Quantum noise theory for the dc SQUID

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3 Author(s)
Koch, Roger H. ; Department of Physics, University of California, and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 ; Van Harlingen, D.J. ; Clarke, John

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The noise temperature of a dc superconducting quantum interference device (SQUID) coupled to a tuned input circuit is computed using the complete quantum expression for the equilibrium noise in the shunt resistance of each junction. At T = 0, where the noise reduces to zero‐point fluctuations, the noise temperature for an optimized system is hn/kB ln2, where n is the signal frequency. The computation is extended to nonzero temperatures, and it is shown that a SQUID operated at 1K can approach the quantum limit.

Published in:

Applied Physics Letters  (Volume:38 ,  Issue: 5 )

Date of Publication:

Mar 1981

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