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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantum Communication III
Q 21.7: Vortrag
Dienstag, 12. März 2024, 12:30–12:45, HS 3219
Co-doping a Crystalline Membrane for Improved Spectral Multiplexing of Rare-earth Emitters — Alexander Ulanowski1,2, Johannes Früh1,2, •Fabian Salamon1,2, Adrian Holzäpfel1,2, and Andreas Reiserer1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2Technische Universität München, TUM School of Natural Sciences, James-Franck-Straße 1, 85748 Garching, Germany
Erbium dopants in solids exhibit a coherent optical transition at a telecommunication frequency and spin coherence times exceeding a second. This offers an exceptional potential for extended quantum networks [1].
To realise an efficient spin-photon interface, a 10 μm thin crystalline membrane is embedded into a Fabry-Perot resonator. The narrow optical transitions of the emitters then allow for spectral multiplexing [2]. In this context, we show that the spectral density and thus the number of individually resolvable qubits can be tailored by co-doping an erbium-doped YSO crystal with europium [3]. Using this technique, more than 360 emitters with an optical coherence that reaches the lifetime limit can be optically resolved with Purcell factors up to 110.
These advances constitute a key step towards large-scale multiplexed entanglement generation for a global quantum network.
[1] A. Reiserer, Rev. Mod. Phys. 94, 041003 (2022). [2] A. Ulanowski, B. Merkel & A. Reiserer, Sci. Adv. 8, eabo4538 (2022). [3] A. Ulanowski, J. Früh, F. Salamon, A. Holzäpfel & A. Reiserer, arXiv:2311.16875 (2023).
Keywords: quantum network; rare-earth emitter; spectral multiplexing; Fabry-Perot-cavity