Charge and current fluctuations in a superconducting single-electron transistor near a Cooper pair resonance

Mahn-Soo Choi, Francesco Plastina, Rosario Fazio

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We analyze charge tunneling statistics and current noise in a superconducting single-electron transistor in a regime where the Josephson-quasiparticle cycle is the dominant mechanism of transport. Due to the interplay between Coulomb blockade and Josephson coherence, the probability distribution for tunneling events strongly deviates from a Poissonian and displays a pronounced even-odd asymmetry in the number of transmitted charges. The interplay between charging and coherence is reflected also in the zero-frequency current noise which is significantly quenched when the quasiparticle tunneling rates are comparable to the coherent Cooper pair oscillation frequency. Furthermore, the finite frequency spectrum shows a strong enhancement near the resonant transition frequency for Josephson tunneling.

Original languageEnglish
Article number045105
Pages (from-to)451051-4510511
Number of pages4059461
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - 2003 Jan 15


ASJC Scopus subject areas

  • Condensed Matter Physics

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