Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Repeater and Quantum Communication

Q 17.3: Talk

Tuesday, March 7, 2017, 11:30–11:45, P 3

An atomic memory suitable for semiconductor quantum dot single photons — •Janik Wolters, Lucas Beguin, Andrew Horsely, Jan-Philipp Jahn, Richard Warburton, and Philipp Treutlein — Universität Basel

Quantum networks will consist of many quantum memory nodes that are interconnected via photonic links, transporting single photons carrying quantum information. In the future, such quantum networks may enable: high-speed quantum cryptography for unconditionally secure communication; large scale quantum computers; and quantum simulators that will allow for exponential speed-up in solving specific complex problems. A promising route towards functional quantum networks is the heterogeneous approach, where different and separately optimized physical systems are used for single photon generation and storage. For example semiconductor quantum dots may be used as efficient, fast and deterministic single photon sources, while atomic ensembles allow for efficient storage of these photons.

We demonstrate a photonic memory in hot Rb vapor with on-demand storage and retrieval. In principle the memory is suitable for storing single photons emitted by an GaAs droplet quantum dot. Operation of the memory is demonstrated using attenuated laser pulses. For pulses with a bandwidth of ∼ 100 MHz ∼ 0.5µeV we achieve ∼ 25% storage and retrieval efficiency, while the storage time approaches 1 µs. The developed quantum memory might become a cornerstone for future hybrid quantum dot-atom based quantum networks.