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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Information (Quantum Communication and Quantum Repeater) II

Q 48.7: Vortrag

Donnerstag, 12. März 2020, 15:45–16:00, e001

Storing single photons in a room temperature vapor cell — •Roberto Mottola¹, Gianni Buser¹, Chris Müller², Tim Kroh², Sven Ramelow², Oliver Benson², Philipp Treutlein¹, and Janik Wolters^1,3 — ¹Universität Basel, Schweiz — ²HU Berlin — ³DLR Institut für optische Sensorsysteme Berlin

Quantum memories are a key ingredient for the realization of quantum networks [1]. Furthermore, they allow the synchronization of probabilistic single photon sources significantly enhancing the generation rates of multiphoton states [2].

We implemented a broadband, optical quantum memory in hot Rb vapor with on-demand storage and retrieval [3]. With a bandwidth matched spontaneous parametric downconversion (SPDC) source, we can generate heralded single photons suited for storage with a heralding efficiency ≈ 50 % [4]. We report on our recent achievements in storing SPDC single photons with a linewidth of 230 MHz with an end-to-end efficiency η_e2e = 1.3(1) % for a storage time of T = 50 ns. A signal to noise ratio of 1.9(2) and a memory lifetime τ = 380 ns are achieved. The measurement of the second order autocorrelation of retrieved single photons results in g⁽²⁾ = 0.91(3), showing that the non-classical properties of the stored light are maintained.

[1] N. Sangouard et al., Rev. Mod. Phys. 83, 33 (2011).

[2] J. Nunn et al., Phys. Rev. Lett. 110, 133601 (2013).

[3] J. Wolters, et al., Phys. Rev. Lett. 119, 060502 (2017).

[4] R. Mottola et al., arXiv:1908.00590v2 (2019).