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Phys Rev Lett. 2009 Jul 24;103(4):043603. Epub 2009 Jul 24.

Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity.

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  • 1Atominstitut der Osterreichischen Universitäten, TU-Wien, 1020 Vienna, Austria.

Abstract

Placing an ensemble of 10;{6} ultracold atoms in the near field of a superconducting coplanar waveguide resonator with a quality factor Q approximately 10;{6}, one can achieve strong coupling between a single microwave photon in the coplanar waveguide resonator and a collective hyperfine qubit state in the ensemble with g_{eff}/2pi approximately 40 kHz larger than the cavity linewidth of kappa/2pi approximately 7 kHz. Integrated on an atomchip, such a system constitutes a hybrid quantum device, which also can be used to interconnect solid-state and atomic qubits, study and control atomic motion via the microwave field, observe microwave superradiance, build an integrated micromaser, or even cool the resonator field via the atoms.

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