Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum Optics

Q 70.3: Talk

Friday, March 15, 2024, 15:00–15:15, HS 3118

Rb-Xe Magnetometer - Quantum Memory Based on Rare Gases — •Denis Uhland¹, Luisa Esguerra^2,4, Norman Vincenz Ewald^2,3, Tianhao Liu³, Wolfgang Kilian³, Jens Voigt³, Janik Wolters^2,4, and Ilja Gerhardt¹ — ¹Leibniz University Hannover, Institute of Solid State Physics, Light and Matter Group, Hannover — ²German Aerospace Center (DLR), Institute of Optical Sensor Systems, Berlin — ³Physikalisch-Technische Bundesanstalt, FB 8.2 Biosignale, Berlin — ⁴Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin

Optical quantum memories allow for the storage and retrieval of quantum information. A common approach to establish such memories is to map the photonic state onto optically accessible matter states. Even longer storage can be realized with rare gases, but unfortunately, they lack convenient optical access, which seemingly can be overcome [1]. Due to spin-exchange collisions arising from a polarized ensemble of alkali atoms, it is possible to transfer photonic states onto optical inaccessible spin states of the nucleus of rare gases. That results in an increase of the memory time from milliseconds seen in alkali vapors to several minutes or even hours [2]. A recent achievement uses ¹³³Cs as an optical interface for photons stored in collective spin excitation via EIT [3]. Here, we present our first steps toward quantum memories based on an Rb-¹²⁹Xe mixture in a magnetically shielded environment.

[1] O. Katz et al., Phys. Rev. A (2022) 105, 042606

[2] C. Gemmel et al., Eur. Phys. J. D (2010) 57, 303

[3] L. Esguerra et al., Phys. Rev. A (2023) 107, 042607

Keywords: Magnetometer; Quantum Memory; Atomic Vapors