Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.5: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Towards a single-photon source based on Rydberg FWM in thermal microcells — •Fabian Ripka, Yi-Hsin Chen, Robert Löw, and Tilman Pfau — 5. Physikalisches Institut Universität Stuttgart, Stuttgart, Deutschland

Photonic quantum devices based on atomic vapors at room temperature combine the advantages of atomic vapors being intrinsicly reproducible as well as semiconductor-based concepts being scalable and integrable. One key device in the field of quantum information are single-photon sources. A promising candidate for realizing an on-demand single-photon source relies on the combination of two atomic effects, namely four-wave mixing (FWM) and the Rydberg blockade.

Coherent dynamics to Rydberg states has been demonstrated in thermal vapor cells on nanosecond timescales [1] and van-der-Waals interaction has been observed [2], where the interaction strength exceeds the energy scale of thermal motion and is thus strong enough to enable quantum correlations. Subsequently, we observed both coherent dynamics and effects of dephasing due to Rydberg-Rydberg interaction also in a pulsed FWM scheme [3]. Both are essential effects for building up a single-photon source. As the next step, we are about to reduce the excitation volume towards below the Rydberg interaction range by use of high-NA optics and spatial confinement. First investigations on effects of the confinement on the FWM signal will be shown.

[1] Huber et al., PRL 107, 243001 (2011)

[2] Baluktsian et al., PRL 110, 123001 (2013)

[3] Huber et al., PRA 90, 053806 (2014)