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TUE: Tuesday Contributed Sessions
TUE 1: QIP Implementations: Photons III
TUE 1.3: Talk
Tuesday, September 9, 2025, 14:45–15:00, ZHG001
Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval — •Benjamin Maaß1,2, Avijit Barua2, Norman Vincenz Ewald1, Elizabeth Jane Robertson1, Kartik Gaur2, Suk In Park3, Sven Rodt2, Jin-Dong Song3, Stephan Reitzenstein2, and Janik Wolters1,2,4 — 1Institute of Space Research, German Aerospace Center (DLR), Germany — 2Institutes of Physics, Technische Universität Berlin, Germany — 3Korean Institute of Technology, Seoul, Republic of Korea — 4Einstein Center Digital Future (ECDF), Berlin, Germany
On-demand storage and retrieval of single photons in coherent light-matter interfaces is a key requirement for distributing quantum information. Here, we demonstrate storage of single photons from a semiconductor quantum dot device in a room-temperature atomic vapor memory and their on-demand retrieval [1]. A deterministically fabricated InGaAs quantum dot light source emits single photons at the cesium D1 transition wavelength (895 nm) with a linewidth of 5.1(7) GHz which are subsequently stored in a low-noise ladder-type cesium vapor memory. We show control over the interaction between the single photons and the atomic vapor, allowing for variable retrieval times of up to 19.8(3) ns and a maximum internal efficiency of ηint=0.6(1)%. This QD-memory interface provides an unprecedented level of control over the temporal mode of the single-photon emitter and represents a step towards heterogeneous platforms for quantum network nodes.
[1] B.Maaß et al. arXiv:2501.15663 (2025)
Keywords: Quantum Memory; Quantum Dot