Quantum noise in current biased Josephson junction

Details Quantum noise in current biased Josephson junction Quantum noise in current biased Josephson junction

2002-12-24

arxiv.org/abs/cond-mat/0212587v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.67.184504

Quantum fluctuations in a current biased Josephson junction, described in terms of the RCSJ-model, are considered. The fluctuations of the voltage and phase across the junction are assumed to be initiated by equilibrium current fluctuations in the shunting resistor. This corresponds to low enough temperatures, when fluctuations of the normal current in the junction itself can be neglected. We used the quantum Langevin equation in terms of random variables related to the limit cycle of the nonlinear Josephson oscillator. This allows to go beyond the perturbation theory and calculate the widths of the Josephson radiation lines.

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