Quantum-noise theory for the resistively shunted josephson junction

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

Research output: Contribution to journalArticlepeer-review


It is shown that the low-frequency spectral density of the voltage noise in a current-biased Josephson junction with critical current I0, shunt resistance R, and small capacitance is eI02R3πV in the limit eVkBT(II0)2 and I>I0, where V is the voltage and I is the current. The noise arises from zero-point current fluctuations in the shunt resistor. The rounding of the current-voltage characteristic caused by the quantum fluctuations and the effects of nonzero junction capacitance are calculated.

Original languageEnglish (US)
Pages (from-to)2132-2135
Number of pages4
JournalPhysical review letters
Issue number26
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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