Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 18: Quantum Effects: Cavity QED I

Q 18.6: Talk

Tuesday, March 7, 2017, 12:15–12:30, P 4

Coupling ultracold atoms to a superconducting coplanar waveguide resonator — •Helge Hattermann, Li Yuan Ley, Daniel Bothner, Benedikt Ferdinand, Conny Glaser, Lörinc Sárkány, Reinhold Kleiner, Dieter Koelle, and József Fortágh — CQ Center for Collective Quantum Phenomena and their Applications, Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

Hybrid quantum systems of superconductors and ultracold atoms have been proposed as a promising candidate for quantum information processing. In such a hybrid system, information is processed by superconducting circuits and stored in an ensemble of trapped atoms, using a superconducting coplanar waveguide resonator as interface between the different quantum systems. Long coherence times of hyperfine superposition states of trapped atoms have already been demonstrated [1], making atoms attractive as a possible quantum memory.

Here, we report on the measurement of the coupling between magnetically trapped ultracold ⁸⁷Rb atoms and a driven coplanar waveguide resonator which is near-resonant to the atomic hyperfine transition. The field in the cavity is characterized by measuring the frequency shift of the atomic clock states dressed by the cavity field. The determination of this dressing shift for different driving frequencies reveals the lorentzian lineshape of the cavity, in agreement with transmission measurements. This coupling is the first step towards the implementation of an atomic quantum memory for superconducting circuits.

[1] S. Bernon et al., Nat. Commun. 4, 2380 (2013)