Abstract:Recent experiments have pushed the studies on atom-photon interactions to the ultrastrong regime, which motivates the exploration of physics beyond the rotation wave approximation. Here we study the single-photon scattering on a system composed by a coupling cavity array with a two-level atom in the center cavity, which, by varying two outside coupling parameters, corresponds to a model from a supercavity QED to a waveguide QED with counter-rotating wave (CRW) interaction. By applying a time-independent scatte… Show more
“…The light-matter interaction in circuit quantum electrodynamics (QED) finds lots of applications in many quantum information processes, such as the simulation of resonance fluorescence [1], an experimental proposal for boson sampling [2] and the single-photon scattering on an atom [3][4][5]. All these achievements show that circuit QED is an excellent platform for studying the physics induced by light-matter interaction [5][6][7][8].…”
Coherent manipulation of a quantum system is one of the main themes in current physics researches. In this work, we design a circuit QED system with a tunable coupling between an artificial atom and a superconducting resonator while keeping the cavity frequency and the atomic frequency invariant. By controlling the time dependence of the external magnetic flux, we show that it is possible to tune the interaction from the extremely weak coupling regime to the ultrastrong coupling one. Using the quantum perturbation theory, we obtain the coupling strength as a function of the external magnetic flux. In order to show its reliability in the fields of quantum simulation and quantum computing, we study its sensitivity to noises.
“…The light-matter interaction in circuit quantum electrodynamics (QED) finds lots of applications in many quantum information processes, such as the simulation of resonance fluorescence [1], an experimental proposal for boson sampling [2] and the single-photon scattering on an atom [3][4][5]. All these achievements show that circuit QED is an excellent platform for studying the physics induced by light-matter interaction [5][6][7][8].…”
Coherent manipulation of a quantum system is one of the main themes in current physics researches. In this work, we design a circuit QED system with a tunable coupling between an artificial atom and a superconducting resonator while keeping the cavity frequency and the atomic frequency invariant. By controlling the time dependence of the external magnetic flux, we show that it is possible to tune the interaction from the extremely weak coupling regime to the ultrastrong coupling one. Using the quantum perturbation theory, we obtain the coupling strength as a function of the external magnetic flux. In order to show its reliability in the fields of quantum simulation and quantum computing, we study its sensitivity to noises.
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