SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: QI Poster II (joint session QI/Q)
Q 43.33: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
Quantum memory in noble-gas nuclear spins with alkali metal vapour as optical interface — •Norman Vincenz Ewald1, Tianhao Liu2, Luisa Esguerra1,3, Ilja Gerhardt4, and Janik Wolters1,3 — 1German Aerospace Center (DLR), Institute of Optical Sensor Systems, Berlin — 2Physikalisch-Technische Bundesanstalt, FB 8.2 Biosignale, Berlin — 3Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin — 4Leibniz University Hannover, Institute of Solid State Physics, Light and Matter Group, Hannover
Quantum memories with storage times well beyond 1 s will spawn manifold applications in quantum communication and information processing, e.g. as quantum token for secure authentication. We present our first steps towards a quantum memory with long storage time in a mixture of the noble gas 129Xe and an alkali metal vapour of 133Cs. A custom glass cell at about room temperature contains both species and is placed inside a table-top magnetic shield. Information will be stored in the collective excitation of nuclear spins of 129Xe, which exhibit hours-long coherence times [1]. 133Cs serves as optical interface for signal photons, which we store in a collective spin excitation using EIT [2]. Coherent information transfer to the noble gas spins is based on spin-exchange collisions and will be controlled by synchronisation of Larmor precession [3].
[1] C. Gemmel et al., Eur. Phys. J. D 57, 303–320 (2010).
[2] L. Esguerra et al., arXiv:2203.06151 (2022).
[3] O. Katz et al., Phys. Rev. A 105, 042606 (2022).