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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Information II
Q 60.20: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Quantum Memories based on Spin Exchange between Alkali Metal and Noble Gas Vapours at Room Temperature — •Norman Vincenz Ewald1, Luisa Esguerra1,2, and Janik Wolters1,2 — 1German Aerospace Center (DLR), Institute of Optical Sensor Systems, Berlin — 2Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin
Quantum memories with optical interfaces and storage times well beyond 1 s will spawn manifold applications in quantum communication, e.g. as quantum tokens for authentication. Compactness and technological simplicity are key parameters for the memory platform to achieve large-scale applicability. Our goal is to realise such a quantum memory in atom vapours at room temperature. We present our approach to use a mixture of a noble gas—with its well isolated nuclear spins that remain coherent for hours [1] serving as long-term memory—and an alkali metal providing the optical interface based on EIT [2]. The optically inaccessible nuclear spins of the noble gas will be addressed by coherent, collisional spin exchange with the alkali metal atoms [3]. Compatibility with existing telecommunication infrastructure may be established by employing bi-chromatic sources of entangled photon pairs with one photon on the alkali atom’s storage transition and one photon suitable for telecom fibres [4].
[1] C. Gemmel et al., Eur. Phys. J. D 57, 303–320 (2010).
[2] J. Wolters et al., Phys. Rev. Lett. 119, 060502 (2017).
[3] O. Katz et al., arXiv:2007.08770v2 (2020).
[4] D. Rieländer et al., New J. Phys. 18, 123013 (2016).