Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information (Quantum Repeater)
Q 47.6: Talk
Wednesday, March 7, 2018, 15:30–15:45, K 1.020
An atomic memory suitable for semiconductor quantum dot single photons — •Roberto Mottola, Andrew Horsley, Gianni Buser, Janik Wolters, Lucas Béguin, Jan-Philipp Jahn, Richard Warburton, and Philipp Treutlein — Universität Basel, Switzerland
Quantum networks have been proposed to overcome current limitations in quantum communication and computing. A promising path to realize these networks is the heterogeneous quantum node approach. Each node consists of separate and thus individually optimizable physical systems to generate and store single photons.
Pursuing the heterogeneous approach we demonstrated a quantum memory in warm Rb vapor with on-demand storage and retrieval [1] that in principle is compatible to semiconductor quantum dot photons. Using attenuated laser pulses on the single-photon level with a 660 MHz linewidth, we have achieved an end-to-end efficiency ηe2e = 3.4(3)% for a storage time of T = 50 ns and an intrinsic storage and retrieval efficiency η = 17(3)%. We are working to further improve the performance of our memory by applying a tesla-order magnetic field, entering the Paschen-Back regime, where the separation of atomic ground state hyperfine sublevels is larger than the optical linewidth. We will be able to optically address each sublevel individually, allowing us to engineer an almost ideal atomic three-level system. This will get rid of spurious single photon absorption and suppress noise due to four-wave mixing, enhancing the efficiency and signal-to-noise ratio of the memory.
[1] J. Wolters, et al., Phys. Rev. Lett. 119, 060502 (2017)