Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 41: Quantum Technologies (Color Centers and Ion Traps) I (joint session Q/QI)

Q 41.7: Talk

Wednesday, March 12, 2025, 16:15–16:30, HS Botanik

Coupling of alkali vapors and rare gases for quantum memories — •Denis Uhland¹, Norman Vincenz Ewald^2,3, Alexander Erl^2,3, Andrés Medina Herrera³, Wolfgang Kilian³, Jens Voigt³, Janik Wolters^2,4, and Ilja Gerhardt¹ — ¹Leibniz University Hannover, Institute of Solid State Physics, Light and Matter Group, Hannover — ²Deutsches Zentrum für Luft- und Raumfahrt, Institute of Optical Sensor Systems, Berlin — ³Physikalisch-Technische Bundesanstalt, 8.2 Biosignals, Berlin — ⁴Technische Universität Berlin, Institute of Optics and Atomic Physics, Berlin

Optical quantum memories allow for the storage and retrieval of quantum information encoded in photons. Despite using an optical interface for photons stored in collective spin excitation via EIT with milliseconds storage time [1], hot mixtures of alkali and rare gas atoms can achieve coherence times up to several hours [2], resulting from spin-exchange collisions, where the optically addressable alkali metals couple to the nuclear spin of the rare gas. R. Shaham et al. [3] discussed how to achieve strong coupling between the electron spin of potassium and the nuclear spin of helium, allowing for efficient spin transfer. We follow the proposed scheme to achieve strong coupling between a hot ensemble of rubidium and xenon, which paves the way towards an efficient quantum memory device and fundamental studies of spin dynamics. [1] L. Esguerra et al., Phys. Rev. A (2023) 107, 042607, [2] C. Gemmel et al., Eur. Phys. J. D (2010) 57, 303, [3] R. Shaham et al., Nat. Phys. L (2022), Vol. 18, No. 5

Keywords: Magnetometer; Quantum Memory; Atomic Vapors