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.
ASJC Scopus subject areas
- Physics and Astronomy(all)