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Photon-assisted tunnelling with nonclassical light

Author

Listed:
  • J. -R. Souquet

    (Laboratoire de Physique des Solides, Université Paris-Sud
    McGill University)

  • M. J. Woolley

    (School of Engineering and Information Technology, University of New South Wales, ADFA)

  • J. Gabelli

    (Laboratoire de Physique des Solides, Université Paris-Sud)

  • P. Simon

    (Laboratoire de Physique des Solides, Université Paris-Sud)

  • A. A. Clerk

    (McGill University)

Abstract

Among the most exciting recent advances in the field of superconducting quantum circuits is the ability to coherently couple microwave photons in low-loss cavities to quantum electronic conductors. These hybrid quantum systems hold great promise for quantum information-processing applications; even more strikingly, they enable exploration of new physical regimes. Here we study theoretically the new physics emerging when a quantum electronic conductor is exposed to nonclassical microwaves (for example, squeezed states, Fock states). We study this interplay in the experimentally relevant situation where a superconducting microwave cavity is coupled to a conductor in the tunnelling regime. We find that the conductor acts as a nontrivial probe of the microwave state: the emission and absorption of photons by the conductor is characterized by a nonpositive definite quasi-probability distribution, which is related to the Glauber–Sudarshan P-function of quantum optics. These negative quasi-probabilities have a direct influence on the conductance of the conductor.

Suggested Citation

  • J. -R. Souquet & M. J. Woolley & J. Gabelli & P. Simon & A. A. Clerk, 2014. "Photon-assisted tunnelling with nonclassical light," Nature Communications, Nature, vol. 5(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6562
    DOI: 10.1038/ncomms6562
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    Cited by:

    1. Gianluca Aiello & Mathieu Féchant & Alexis Morvan & Julien Basset & Marco Aprili & Julien Gabelli & Jérôme Estève, 2022. "Quantum bath engineering of a high impedance microwave mode through quasiparticle tunneling," Nature Communications, Nature, vol. 13(1), pages 1-6, December.

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