From Adiabatic to Dispersive Readout of Quantum Circuits

Spectral properties of a quantum circuit are efficiently read out by monitoring the resonance frequency shift it induces in a microwave resonator coupled to it. When the two systems are strongly detuned, theory attributes the shift to an effective resonator capacitance or inductance that depends on the quantum circuit state. At small detuning, the shift arises from the exchange of virtual photons, as described by the Jaynes-Cummings model. Here we present a theory bridging these two limits and illustrate, with several examples, its necessity for a general description of quantum circuits readout.Fil: Park, Sunghun. Universidad Autónoma de Madrid; EspañaFil: Metzger, Cyril. Centre National de la Recherche Scientifique; Francia. Université Paris-Saclay; FranciaFil: Tosi, Leandro. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Goffman, Marcelo Fabián. Centre National de la Recherche Scientifique; Francia. Université Paris-Saclay; FranciaFil: Urbina, Belén del Carmen. Centre National de la Recherche Scientifique; Francia. Université Paris-Saclay; FranciaFil: Pothier, Hugues. Centre National de la Recherche Scientifique; Francia. Université Paris-Saclay; FranciaFil: Levy Yeyati, Alfredo. Universidad Autónoma de Madrid; Españ