Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster – Quantum Information Technologies (joint session Q/QI)

Q 62.19: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Towards a spin-exchange collision-based optical quantum memory in noble-gas spins — •Alexander Erl^1,2, Norman Vincenz Ewald^1,2, Andrés Medina Herrera², Denis Uhland³, Wolfgang Kilian², Jens Voigt², Ilja Gerhardt³, and Janik Wolters^1,4 — ¹DLR, Institute of Optical Sensor Systems, Berlin — ²PTB, 8.2 Biosignals, Berlin — ³LUH, Institute of Solid State Physics, Hannover — ⁴TUB, Institute of Optics and Atomic Physics, Berlin

A critical limitation on current room-temperature quantum memory systems [1] is the maximum achievable storage time on the order of a few µs, which must be extended for various quantum communication applications, such as unforgeable quantum tokens for authentication. We report on our first steps towards a long-lived quantum memory with an all-optical interface based on a mixture of ¹²⁹Xe noble gas and ¹³³Cs alkali metal vapor, both confined in a glass cell at near room temperature. The interface relies on EIT, implemented through a Λ-scheme in the Zeeman sublevels of the long-lived hyperfine ground states of ¹³³Cs, coupled to an excited state via the D₁ line at 895 nm [2]. Spin-exchange collisions in the strong coupling regime are envisioned to transfer the stored information from the alkali vapor to the noble gas [3]. The coherence time of ¹²⁹Xe, which can extend up to several hours [4], offers the potential for long-term storage of quantum information in collective atomic excitations. [1] M. Jutisz et al., arXiv:2410.21209 (2024) [2] G. Buser et al., PRX, 020349 (2022) [3] O. Katz et al., PRA 105, 042606 (2022) [4] C. Gemmel et al., EPJ D 57, 303-320 (2010)

Keywords: Quantum memory; Quantum repeater; Quantum communication