Atomic-superconducting hybrid systems are of particular interest as they are combining the long coherence times of ultracold atoms and fast gate operation times of superconducting circuits. Here we discuss an experimental realization of an interface between cold Rydberg atoms and a transmon circuit embedded in a microwave cavity. We present numerical calculations showing a significant coupling of Rydberg atoms to a transmon. Here we place the atoms in the vicinity of the transmon shunting capacitor. Exciting them to the Rydberg states alters the dielectric constant of the medium inside the capacitor. This results in a dispersive shift of the transmon resonance frequency. Using the protocols developed in Ref. 1, 2 will allow the coherent transfer of quantum states between these two systems.
Christoph Hufnagel, Alessandro Landra, Lim Chin Chean, Deshui Yu, and Rainer Dumke, "Superconducting atom chips: towards quantum hybridization," Proc. SPIE 10358, Quantum Photonic Devices, 103580D (Presented at SPIE Nanoscience + Engineering: August 06, 2017; Published: 29 August 2017); https://doi.org/10.1117/12.2275929.
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