Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics (Miscellaneous)

Q 61.7: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Construction of a new type of room-temperature single-photon source based on two-photon interferences — •Lucas Pache, Martin Cordier, Francisco Crespo, Charlotta Gurr, Max Schemmer, Philipp Schneeweiss, Jürgen Volz, and Arno Rauschenbeutel — Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany

Single-photon sources are a key component for future quantum technologies. Here, we report on the progress in implementing a new type of single-photon source. This source relies on a two-photon interference effect which has been recently demonstrated in a proof-of-principle experiment with cold atoms [1]. The mechanism relies on engineering destructive two-photon interference, in order to transform a coherent laser field into a stream of single photons [2]. The physical origin of this effect is the collectively enhanced non-linear response of many weakly coupled atoms. Now, we transfer this concept to a vapor cell experiment with ⁸⁵Rb atoms and circumvent Doppler broadening by a two-color excitation scheme. This allows to generate indistinguishable single photons from a compact room-temperature source. The scheme can be readily adapted to the telecom range (1529nm).

[1] Prasad, et. al, Nature Phot. (2020).

[2] European patent pending (PCT/EP2019/075386).