Charge noise at cooper-pair resonances

P. G. Kirton, M. Houzet, F. Pistolesi, A. D. Armour

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1 Citation (Scopus)

Abstract

We analyze the charge dynamics of a superconducting single-electron transistor (SSET) in the regime where charge transport occurs via Cooper-pair resonances. Using an approximate description of the system Hamiltonian, in terms of a series of resonant doublets, we derive a Born-Markov master equation describing the dynamics of the SSET. The average current displays sharp peaks at the Cooper-pair resonances and we find that the charge noise spectrum has a characteristic structure which consists of a series of asymmetric triplets of peaks. The strongest feature in the charge noise spectrum is the triplet of peaks centered at zero frequency which has a peak spacing equal to the level separation within the doublets and is similar to the triplet in the spectrum of a driven, damped, two-level system. We also explore the backaction that the SSET charge noise would have on an oscillator coupled to the island charge, measurement of which provides a way of probing the charge noise spectrum.

Original languageEnglish
Article number064519
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number6
DOIs
Publication statusPublished - 24 Aug 2010

Keywords

  • superconducting single-electron transistor (SSET)
  • charge dynamics
  • cooper-pair resonances

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