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QI: Fachverband Quanteninformation

QI 8: Quantum Information: Poster (joint session QI/Q)

QI 8.18: Poster

Mittwoch, 22. September 2021, 16:30–18:30, P

Toward a Photon-Photon Quantum Gate Based on Cavity Rydberg EIT — Thomas Stolz, •Hendrik Hegels, Bianca Röhr, Maximilian Winter, Ya-Fen Hsiao, Stephan Dürr, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann Str. 1, 85748 Garching, Germany

All realizations of optical photon-photon quantum gates to date suffer from low efficiency [1]. Theory suggests that this limitation can be overcome using Rydberg electromagnetically induced transparency (EIT) in an optical cavity of moderate finesse [2]. We have set up a new vacuum system, which houses a cavity, in which an ultracold atomic ensemble is held in an optical dipole trap. The ensemble is cooled in multiple stages to a temperature of 0.2 µK. This low temperature is needed to achieve a long coherence time [3]. We report on the observation of cavity Rydberg EIT. This is a promising step on the way to a future realization of a photon-photon gate.

[1] K. Kieling et al. NJP 12, 013003 (2010), B. Hacker et al. Nature 536, 193 (2016), D. Tiarks et al. Nat. Phys. 15, 124 (2019).

[2] Y. Hao et al. Sci. Rep. 5, 10005 (2015), S. Das et al. PRA 93, 040303 (2016).

[3] S. Schmidt-Eberle et al. PRA 101, 013421 (2020).