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A: Fachverband Atomphysik

A 28: Ultracold plasmas and Rydberg systems (with Q)

A 28.3: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Storage of coherences and single-photon sources via Rydberg state in thermal vapors — •Yi-Hsin Chen, Fabian Ripka, Robert Löw, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart

Photons are good information carriers, which can be stored and retrieved among different quantum devices. We perform the storage of coherences via a highly excited Rydberg state in thermal vapors. These photonic quantum devices are intrinsically reproducible and scalable, towards the potential application of the photonic-based quantum security communication and information processing. The scheme is based on the combination of four-wave-mixing (FWM) and Rydberg blockade effects in a 220 micrometer thick vapor cell. In the pulsed FWM scheme, we observe coherent dynamics [1] and measure the lifetime of the stored coherence, which is around 1 ns, limited by motional dephasing of the thermal vapors. Moreover, we are going to reduce the excitation volume towards below the Rydberg interaction range by use of high-NA optics and spatial confinement for generating a deterministic single-photon source [2].

[1] Huber et al., PRA 90, 053806 (2014) [2] M. M. Müller et al., PRA 87, 053412 (2013)