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Q: Fachverband Quantenoptik und Photonik

Q 43: QI Poster II (joint session QI/Q)

Q 43.35: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Towards coherent single praseodymium ion quantum memories in optical fiber microcavities — •Sören Bieling¹, Nicholas Jobbitt¹, Roman Kolesov², and David Hunger¹ — ¹Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Universität Stuttgart, 70569 Stuttgart, Germany

Rare earth ions doped into solids show exceptional quantum coherence in their ground-state hyperfine levels. These spin states can be efficiently addressed and controlled via optical transitions and are thus ideally suited to serve as quantum memories and nodes of quantum networks. However, while long storage times, high storage efficiencies and storage on the single photon level have all been demonstrated separately, they could not yet be achieved simultaneously. We aim to demonstrate both long and efficient single quantum storage in the ground-state hyperfine levels of single Pr³⁺ ions doped into yttrium orthosilicate (YSO) by integrating them as a membrane into optical high-finesse fiber-based Fabry-Pérot microcavities. This allows for efficient addressing and detection of individual ions. We report on the design, commissioning and initial characterization of a next-gen cryogenic scanning microcavity as well as on its experimental integration into and design of a self-built vector magnet. It allows for future coherence prolongation by operating under a zero first-order Zeeman (ZEFOZ) shift magnetic field alongside dynamical decoupling sequences. Together with the Purcell enhanced emission and ultrapure Pr³⁺:YSO membranes this strives to realize efficient and coherent spin-photon interfaces suitable for deployment in scalable quantum networks.