Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Quantum Information (Quantum Communication) I
Q 28.5: Talk
Wednesday, March 16, 2022, 11:30–11:45, Q-H12
A multi-rail random-access optical memory in hot Cs with 4 µs lifetime — •Leon Meßner1,2,3, Elizabeth Robertson2,3, Luisa Esguerra2,3, Kathy Lüdge4, and Janik Wolters2,3 — 1Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institute of Optical Sensor Systems, Rutherfordstr. 2, 12489 Berlin, Germany — 3Technische Universität Berlin, Institut für Optik und Atomare Physik, Str. des 17 Juni 135, 10623 Berlin, Germany — 4Institute of Physics, Technische Universität Ilmenau, Weimarer Str. 25, 98693 Ilmenau, Germany
Random-access quantum memories (RAQMs) are considered essential in near-term quantum communication networks [1] and computing architectures. In contrast to demonstrated RAQMs in cold ensembles or single atoms, this work demonstrates an optical memory in hot Cs vapor, that is comparatively easy to miniaturize and integrate into ground and space-borne devices. Using an acousto-optic deflector (AOD) to deflect the co-propagating signal and control pulses in an EIT memory setup [2], we show a multi-rail optical memory with random access using four parallel rails in a single Cs vapor cell. Extending the number of rails is feasible with specialized AODs and a 2-dimensional lattice of rails. The 1/e lifetime of our memory was found to be 4 µs, limited by magnetic noise, and we achieved rail dependent internal memory efficiencies of between 33% and 42%.
[1] Wallnöfer, J. et al., arXiv:2110.15806 [quant-ph] (2021)
[2] Wolters, J. et al., PRL, 119, 060502 (2017)