Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.51: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent B

Towards Quantum Memories in Noble-Gas Nuclear Spins with Alkali Metal Vapour as Optical Interface — •Norman Vincenz Ewald^1,2, Tianhao Liu^2,5, Alexander Erl^1,2, Luisa Esguerra^1,3, Wolfgang Kilian², Jens Voigt², Denis Uhland⁴, 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, Hannover — ⁵Tragically deceased on 22 July 2023.

Quantum memories with storage times well beyond 1 s will spawn manifold applications in quantum communication, e.g. as quantum token for 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., Phys. Rev. A 107, 042607 (2023). [3] O. Katz et al., Phys. Rev. A 105, 042606 (2022).

Keywords: quantum memory; magnetometer; noble gas; ultra-long storage times; spin-exchange