Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Materials and Devices for Quantum Technology I

HL 6.14: Vortrag

Montag, 17. März 2025, 18:30–18:45, H13

Erbium dopants in nanophotonic resonators — •Andreas Gritsch, Alexander Ulanowski, Stephan Rinner, Johannes Früh, Jakob Pforr, and Andreas Reiserer — Technical University of Munich, TUM School of Natural Sciences and Munich Center for Quantum Science and Technology (MCQST), 85748 Garching, Germany

Optically addressable spin qubits are pristine candidates for large-scale quantum networks [1] and modular quantum computing architectures [2]. Erbium dopants are the only emitter with a coherent optical transition in the minimal-loss-band of optical fibers. In silicon, erbium integration is compatible with industrial-grade nanofabrication processes [4]. In nanophotonic resonators efficient spin-photon interfaces can be realized, in which about ten single dopants can be resolved with Purcell enhancement up to 177. Their spin state can be initialized and read out with a combined fidelity of 87%. This spin further exhibits a second-long lifetime and a Hahn-echo coherence time of 48 s [4]. We further investigate the optical coherence and the spectral multiplexing capabilities in our silicon devices, which allows a detailed comparison to our experiments with YSO membranes integrated into Fabry-Perot resonators [5].

[1] A. Reiserer, Rev. Mod. Phys. 94, 041003 (2022). [2] S. Simmons, PRX Quantum 5, 010102 (2024). [3] S. Rinner, et al., Nanophotonics 12 (2023). [4] A. Gritsch, et al., arXiv:2405.05351 (2024), Nat. Commun., (in press). [5] A. Ulanowski, et al., Advanced Optical Materials 12 (2024).

Keywords: erbium in silicon; rare-earth dopants; photonic quantum technologies; spins in silicon; spin qubits