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Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum Information (Quantum Repeater) II

Q 51.4: Talk

Thursday, March 14, 2019, 14:45–15:00, S HS 002 Chemie

Rb vapor cell quantum memory for single photons — •Janik Wolters1, Gianni Buser1, Roberto Mottola1, Chris Müller2, Tim Kroh2, Richard Warburton1, Oliver Benson2, and Philipp Treutlein11University of Basel — 2Humboldt-Universität zu Berlin

Quantum memories are an essential ingredient for quantum repeaters [1] and an enabler for advanced optical quantum simulators [2].

We implemented a broadband optical quantum memory with on-demand storage and retrieval in hot Rb vapor [3]. Operating at the Rb D2 line, the versatile memory is suited for storing single photons emitted by an GaAs droplet quantum dots [4] or single photons from spontaneous parametric downconversion (SPDC) sources [5].
We report on our recent achievements: reducing the readout noise far below the single input photon equivalent (µ1≪ 1); increasing the memory lifetime to several µ s; storage of single photons with a bandwidth of ∼ 150 MHz, generated by a SPDC source with 40 % heralding efficiency.

[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] J.-P. Jahn, et al. Phys. Rev. B 92, 245439 (2015)

[5] A. Ahlrichs et al., Appl. Phys. Lett. 108, 021111 (2016)

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