DPG Phi
Verhandlungen
Verhandlungen
DPG

Freiburg 2019 – scientific programme

Sessions | Days | Selection | Search | Updates | Downloads | Help

FM: Fall Meeting

FM 54: Quantum Networks: Quantum Memory and Gates

FM 54.4: Talk

Wednesday, September 25, 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 Treutlein11Universität 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).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2019 > Freiburg