Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-01-15
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 2 figures; to appear in the proceedings of the NATO ASI "New Directions in Mesoscopic Physics", Erice, 2002
Scientific paper
We discuss the counting statistics and current noise associated with the double Josephson quasiparticle resonance point in a superconducting single electron transistor. The counting statistics are in general phase-dependent, despite the fact that the average current has no dependence on phase. Focusing on parameter regimes where the counting statistics have no phase-dependence, we use a general relation first derived by MacDonald in 1948 to obtain the full frequency-dependent shot noise directly from the counting statistics, without any further approximations. We comment on problems posed by the phase-dependence of the counting statistics for the finite-frequency noise.
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