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Article Dans Une Revue Nature Communications Année : 2014

ARTICLE Photon-assisted tunnelling with nonclassical light

M J Woolley
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P. Simon
A A Clerk
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Résumé

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.
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Dates et versions

hal-02463712 , version 1 (01-02-2020)

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J.-R Souquet, M J Woolley, J. Gabelli, P. Simon, A A Clerk. ARTICLE Photon-assisted tunnelling with nonclassical light. Nature Communications, 2014, ⟨10.1038/ncomms6562⟩. ⟨hal-02463712⟩
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