Microwave quantum optics and electron transport through a metallic dot strongly coupled to a transmission line cavity

Article

关键词: FLUCTUATIONS;    ENVIRONMENT;    RESONATOR;    BLOCKADE;    QUBITS;    STATES;    NOISE;    ATOM;   

DOI  :  10.1103/PhysRevB.85.045446

来源: SCIE

【 摘 要 】

We investigate theoretically the properties of the photon state and the electronic transport in a system consisting of a metallic quantum dot strongly coupled to a superconducting microwave transmission line cavity. Within the framework of circuit quantum electrodynamics, we derive a Hamiltonian for arbitrary strong capacitive coupling between the dot and the cavity. The dynamics of the system is described by a quantum master equation, accounting for the electronic transport as well as the coherent, nonequilibrium properties of the photon state. The photon state is investigated, focusing on, for a single active mode, signatures of microwave polaron formation and the effects of a nonequilibrium photon distribution. For two active photon modes, the intermode conversion and polaron coherences are investigated. For the electronic transport, electrical current and noise through the dot and the influence of the photon state on the transport properties are at the focus. We identify clear transport signatures due to the nonequilibrium photon population, in particular the emergence of superpoissonian shot noise at ultrastrong dot-cavity couplings.

【 授权许可】

Free