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Q: Fachverband Quantenoptik und Photonik
Q 64: Solid State Quantum Optics II
Q 64.6: Vortrag
Freitag, 15. März 2024, 12:15–12:30, HS 3219
Room-temperature ladder-type memory compatible with single photons from InGaAs quantum dots — •Benjamin Maaß1,2,3, Norman Vincenz Ewald1,2,3, Avijit Barua3, Stephan Reitzenstein3, and Janik Wolters1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für optische Sensorsysteme, Berlin — 2Technische Universität Berlin, Institut für Optik und atomare Physik, Berlin — 3Technische Universität Berlin, Institut für Festkörperphysik, Berlin
The on-demand storage and retrieval of quantum information in coherent light-matter interfaces is a key requirement for future quantum network and quantum communication applications. Non-cryogenic alkali vapor memories offer scalable and robust high-bandwidth storage at high repetition rates which makes them a natural fit for interfaces with single-photon sources. We present a detailed experimental characterization of a room-temperature ladder-type atomic vapor-based memory that operates on the Cs D1 line. We demonstrate on-demand storage and retrieval of weak coherent laser pulses (0.06 photons per pulse) at a high signal-to-noise ratio (SNR=625). The memory reaches a maximum internal storage efficiency of ηint=16 % and a 1/e storage time of τs=24 ns. Benchmark properties for the storage of single photons from inhomogeneously broadened state-of-the-art solid state emitters are estimated from the memory’s performance. Together with the immediate availability of InGaAs quantum dots emitting at 894 nm this provides a clear prospect for experiments on a heterogeneous on-demand quantum light interface.
Keywords: Quantum Memory; Quantum Dot