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Q: Fachverband Quantenoptik und Photonik
Q 43: Quantum Technologies
Q 43.9: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Towards a quantum memory for single photons from semiconductor quantum dots — •Benjamin Maaß1,2,3, Florian Günther1,2, Luisa Esguerra1,2, David Becker1,2, Norman Ewald1, and Janik Wolters1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt, Berlin — 2Institut für Optik und atomare Physik, Technische Universität Berlin — 3Optische Systeme, Institut für Physik, Humboldt Universität Berlin
We present our approach to use room temperature cesium vapour as storage medium for single photons from semiconductor quantum dots at the D1 line employing a ladder-type configuration of electromagnetically induced transparency (FLAME[1],ORCA[2]). As first steps towards storage of photons in the collective spin state of the atoms we investigate the initialisation of all atoms in the maximally polarised state mf=4 of the F=4 hyperfine level of the 62S1/2 groundstate. Two-colour optical pumping with circularly polarised light enables efficient preparation of this individual Zeeman sublevel.
We present our experimental setup and discuss its prospects for storing attenuated laser pulses and even true single photons. We give an outlook on interfacing the memory with a strain tunable semiconductor quantum dot.
[1] R. Finkelstein et.al., Fast, noise-free memory for photon synchronization at room temperature. Sci. Adv. 4,(2018). [2] K. T. Kaczmarek et.al., High-speed noise-free optical quantum memory, Phys. Rev. A 97, 042316 (2018).