"Quantum noise in a current biased Josephson junction"
Prof. Yehoshua Levinson
of Condensed Matter Physics, The Weizmann Institute
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.
Dr. Ron Lifshitz, x5145