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QI: Fachverband Quanteninformation

QI 23: Poster II (joint session QI/Q)

QI 23.33: 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 Esguerra^1,3, Ilja Gerhardt⁴, and Janik Wolters^1,3 — 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).