Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 54: Quantum Networks: Quantum Memory and Gates
FM 54.4: Talk
Mittwoch, 25. September 2019, 15:00–15:15, 1015
Storing single photons in a room temperature vapor cell — •Roberto Mottola1, Gianni Buser1, Janik Wolters1,2, Chris Müller3, Tim Kroh3, Sven Ramelow3, Oliver Benson3, and Philipp Treutlein1 — 1Universität Basel, Schweiz — 2DLR Institut für optische Sensorsysteme Berlin — 3HU 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 [4] with a heralding efficiency ≈ 50%.
We report on our recent achievements in storing SPDC single photons with a linewidth of 230 MHz with an end-to-end efficiency ηe2e = 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 = 380ns 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] A. Ahlrichs et al., Appl. Phys. Lett. 108, 021111 (2016).