SAMOP 2021 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 7: Quantum Information: Applications
QI 7.7: Vortrag
Mittwoch, 22. September 2021, 12:15–12:30, H4
Towards satellite-suited noise-free quantum memories — •Luisa Esguerra1,2, Leon Meßner1,2, Elizabeth Robertson1,2, Mustafa Gündoğan1,3, and Janik Wolters1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institute of Optical Sensor Systems, 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.
The use of memory-assisted quantum repeaters on satellites as transmission links between the nodes of a quantum network could push the current distance limit for quantum key distribution QKD [1]. We have realised a technologically simple, satellite-suited quantum memory in Caesium vapour, based on electromagnetically induced transparency (EIT) on the D1 line, similar to [2]. We have achieved light storage at the single-photon level with end-to-end efficiencies up to 11%, which correspond to internal memory efficiencies of up to 44%. We also achieve a maximal signal-to-noise level of unity for input signal pulses containing µ1=0.029 photons. Furthermore, we have determined the limiting noise source at this level to be spontaneous Raman scattering processes in the Lambda-system.
[1] M. Gündoğan et al., arXiv:2006.10636 (2020)
[2] J. Wolters, et al., PRL 119, 060502 (2017)