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Proceedings Paper

Quantum noise in current-biased Josephson junction
Author(s): Yehoshua Levinson
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Paper Abstract

We consider quantum fluctuations in a current biased overdamped Josephson junction in the regime when the bias current is larger than the critical current. 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. Quantum effects are important when the resistor temperature is low compared to the Josephson frequency, even in the case when noise is measured at frequencies lower than the temperature. 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.

Paper Details

Date Published: 9 May 2003
PDF: 10 pages
Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003); doi: 10.1117/12.501833
Show Author Affiliations
Yehoshua Levinson, Weizmann Institute of Science (Israel)


Published in SPIE Proceedings Vol. 5112:
Noise as a Tool for Studying Materials
Michael B. Weissman; Nathan E. Israeloff; A. Shulim Kogan, Editor(s)

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