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Non-equilibrium 8π Josephson effect in atomic Kitaev wires

Author

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  • C. Laflamme

    (Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
    Institute for Theoretical Physics, University of Innsbruck)

  • J. C. Budich

    (Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
    Institute for Theoretical Physics, University of Innsbruck)

  • P. Zoller

    (Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
    Institute for Theoretical Physics, University of Innsbruck)

  • M. Dalmonte

    (Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
    Institute for Theoretical Physics, University of Innsbruck)

Abstract

The identification of fractionalized excitations, such as Majorana quasi-particles, would be a striking signal of the realization of exotic quantum states of matter. While the paramount demonstration of such excitations would be a probe of their non-Abelian statistics via controlled braiding operations, alternative proposals exist that may be easier to access experimentally. Here we identify a signature of Majorana quasi-particles, qualitatively different from the behaviour of a conventional superconductor, which can be detected in cold atom systems using alkaline-earth-like atoms. The system studied is a Kitaev wire interrupted by an extra site, which gives rise to super-exchange coupling between two Majorana-bound states. We show that this system hosts a tunable, non-equilibrium Josephson effect with a characteristic 8π periodicity of the Josephson current. The visibility of the 8π periodicity of the Josephson current is then studied including the effects of dephasing and particle losses.

Suggested Citation

  • C. Laflamme & J. C. Budich & P. Zoller & M. Dalmonte, 2016. "Non-equilibrium 8π Josephson effect in atomic Kitaev wires," Nature Communications, Nature, vol. 7(1), pages 1-7, November.
  • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12280
    DOI: 10.1038/ncomms12280
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