Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 57: Quantum Dots and Wires: Optics II
HL 57.6: Vortrag
Freitag, 21. März 2025, 10:45–11:00, H13
On-demand storage and retrieval of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory — •Avijit Barua1, Benjamin Maaß1,2, Norman Vincenz Ewald1,2, Elizabeth Robertson2, Kartik Gaur1, Suk In Park3, Sven Rodt1, Jin-Dong Song3, Stephan Reitzenstein1, and Janik Wolters2 — 1Technische Universität Berlin (TUB), Berlin, Germany — 2German Aerospace Center (DLR), Berlin, Germany — 3Korea Institute of Science and Technology (KIST), Seoul, Republic of Korea
Interfacing light from solid-state single-photon sources with scalable and robust room-temperature quantum memories has been a long-standing challenge in photonic quantum information technologies due to inherent noise processes and time-scale mismatches between the operating conditions of solid-state and atomic systems. Here, we demonstrate on-demand storage and retrieval of single photons from a semiconductor QD device in a room-temperature atomic vapor memory. A deterministically fabricated InGaAs QD light source emits single photons at the wavelength of the cesium D1 line at 895 nm which exhibit an inhomogeneously broadened linewidth of 5.1(7) GHz and 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 at an internal efficiency of 0.6(1)%. Our results significantly expand the application space of both room-temperature vapor memories and semiconductor QDs in future quantum network architectures.
Keywords: Semiconductor Quantum Dot; Circular Bragg gratings; In-situ Electron-beam lithography; Atomic vapor memory