Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 35: Quantum Information (Quantum Communication) II
Q 35.6: Vortrag
Mittwoch, 16. März 2022, 15:15–15:30, Q-H12
Readout-noise analysis and optimization of a warm vapor EIT memory on the Cs D1 line — •Luisa Esguerra1,2, Leon Meßner1,3, Elizabeth Robertson1,2, Norman Vincenz Ewald1, Mustafa Gündoğan1,3, and Janik Wolters1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Optische Sensorsysteme, Rutherfordstr. 2, 12489 Berlin, Germany. — 2TU Berlin, Institut für Optik und Atomare Physik, Hardenbergstr. 36, 10623 Berlin, Germany. — 3Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, Berlin 12489, Germany.
Noise-free quantum memories are a missing building block in the implementation of quantum repeaters, which will be crucial for long distance quantum communication [1]. We have realized a technologically simple, in principle satellite-suited quantum memory in Cesium vapour, based on electromagnetically induced transparency (EIT) on the ground states of the Cs D1 line, similar to [2]. We focus on the simultaneous optimization of end-to-end efficiency and signal-to-noise level in the memory, and have achieved light storage at the single-photon level with end-to-end efficiencies up to 12%. Simultaneously we achieve a minimal noise level corresponding to µ1=0.029 signal photons. Furthermore, we have determined the limiting noise source at this level to be four-wave mixing in the Λ-system and present solutions to minimize this read-out noise.
[1] M. Gündoğan et al., npj Quantum Information 7, 128 (2021)
[2] J. Wolters, et al., PRL 119, 060502 (2017)