Photon-assisted tunnelling with nonclassical light

J. -R. Souquet, M. J. Woolley, J. Gabelli, P. Simon () and A. A. Clerk ()
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J. -R. Souquet: Laboratoire de Physique des Solides, Université Paris-Sud
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

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6562

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