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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.19: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Towards a Photon-Photon Quantum Gate Using Rydberg-Interactions in an Optical Resonator — •Thomas Stolz, Steffen Schmidt-Eberle, Lukas Husel, Stephan Dürr, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

We recently realized a photon-photon π-phase gate based on free-space Rydberg EIT in an ultracold atomic ensemble [1]. The performance in terms of efficiency and postselected fidelity is limited by dephasing resulting from the interaction between the Rydberg electron and surrounding ground-state atoms. The dephasing rate can be much reduced by working at lower atomic density [2]. To keep the gate operational in this regime, we plan to place the ensemble inside a moderate-finesse optical resonator [3,4]. We report on experimental progress toward this goal.

[1] D. Tiarks et al. Nat. Phys. 15, 124 (2019). [2] S. Schmidt-Eberle et al. arXiv:1909.00680. [3] Y. M. Hao et al. Sci. Rep. 5, 10005 (2015). [4] S. Das et al. PRA 93, 040303 (2016).