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Shot Noise for Resonant Cooper Pair Tunneling

Mahn-Soo Choi, Francesco Plastina, Rosario Fazio

DOI 10.1103/PhysRevLett.87.116601 · Physical Review Letters

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Abstract

We study intrinsic noise of current in a superconducting single-electron transistor, taking into account both coherence effects and Coulomb interaction near a Cooper pair resonance. Because of this interplay, the statistics of tunneling events deviates from the Poisson distribution and, more important, it shows even-odd asymmetry in the transmitted charge. The zero-frequency noise is suppressed significantly when the quasiparticle tunneling rates are comparable to the coherent oscillation frequency of Cooper pairs.

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