Strong Magnetic Coupling of an Ultracold Gas to a Superconducting Waveguide Cavity 论文

摘要

Placing an ensemble of ${10}^{6}$ ultracold atoms in the near field of a superconducting coplanar waveguide resonator with a quality factor $Q\ensuremath{\sim}{10}^{6}$, 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 ${g}_{\mathrm{eff}}/2\ensuremath{\pi}\ensuremath{\sim}40\text{ }\text{ }\mathrm{kHz}$ larger than the cavity linewidth of $\ensuremath{\kappa}/2\ensuremath{\pi}\ensuremath{\sim}7\text{ }\text{ }\mathrm{kHz}$. 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.