Bonn 2025 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 13: Quantum Networks, Repeaters, and QKD II (joint session Q/QI)

QI 13.3: Vortrag

Dienstag, 11. März 2025, 11:30–11:45, AP-HS

All-optical control and readout of individual ¹⁶⁷Er nuclear spin qubits — Alexander Ulanowski, •Fabian Salamon, Johannes Früh, Adrian Holzäpfel, and Andreas Reiserer — Technical University of Munich, TUM School of Natural Sciences and Munich Center for Quantum Science and Technology (MCQST), 85748 Garching, Germany

Nuclear spins in solids exhibit exceptional coherence times and their coupling to nearby electron spins can enable optical interfacing [1]. In this work, we focus on the nuclear spin of ¹⁶⁷Er dopants, which feature an optical transition within the low-loss wavelength window of optical fibers. Using a high-finesse cryogenic Fabry-Perot cavity [2], we achieve all-optical control and readout of individual ¹⁶⁷Er dopants in a thin yttrium orthosilicate crystal. In our experiment we demonstrate a single-shot readout fidelity of 92(1)% and a hyperfine coherence time exceeding 0.2 s under dynamical decoupling. This makes our system well-suited for spin-photon entanglement, an important step towards developing long-range, fiber-based quantum networks and quantum repeaters.

[1] M. Zhong, M. Hedges, R. Ahlefeldt et al., Nature 517, 177-180 (2015).

[2] A. Ulanowski, J. Früh, F. Salamon, A. Holzäpfel & A. Reiserer, Adv. Optical Mater., 12, 2302897 (2024).

Keywords: Quantum networks; Rare-earth; Spin-photon interfaces; All-optical