Quantum noise theory for the dc SQUID

Roger H. Koch; D. J. Van Harlingen; John Clarke

doi:10.1063/1.92345

Quantum noise theory for the dc SQUID

Roger H. Koch, D. J. Van Harlingen, John Clarke

Research output: Contribution to journal › Article › peer-review

Abstract

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/k_B 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.

Original language	English (US)
Pages (from-to)	380-382
Number of pages	3
Journal	Applied Physics Letters
Volume	38
Issue number	5
DOIs	https://doi.org/10.1063/1.92345
State	Published - 1981
Externally published	Yes

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Physics and Astronomy (miscellaneous)

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10.1063/1.92345

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abstract = "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.",

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AU - Clarke, John

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AB - 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.

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Quantum noise theory for the dc SQUID

Abstract

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