Circuit-QED:How strong can the coupling between a Josephson junction atom and a transmission line resonator be?
نویسندگان
چکیده
After reviewing the limitation by the fine structure constant α of the dimensionless coupling constant of an hydrogenic atomwith amode of the electromagnetic field in a cavity, we show that the situation presents itself differently for an artificial Josephson atom coupled to a transmission line resonator. Whereas the coupling constant for the case where such an atom is placed inside the dielectric of the resonator is proportional to α, the coupling of the Josephson atom when it is placed in series with the conducting elements of the resonator is proportional to α−1/2 and can reach values greater than 1.
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