Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.35: Poster
Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer
A Protocol for Multiplexed Entanglement Generation with Distinguishable Telecom Emitters — •Fabian Salamon1,2, Olivier Kuijpers1,2, 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
Second-long spin coherence times and emission in the minimal-loss telecommunication window make erbium dopants in solid-state host crystals a particularly attractive candidate for future quantum network applications [1].
Spectral diffusion has so far prevented the generation of entanglement between these erbium emitters, since most entanglement protocols require the emission of indistinguishable photons. Here, we present a protocol that bypasses this constraint: Upon reflection on a strongly coupled atom-cavity system, a high-fidelity controlled-Z gate can be applied to a photon [2]. Since the bandwidth of this gate is larger than the spectral diffusion, entanglement can be generated between two distinguishable erbium emitters.
The envisioned hybrid platform combines a large-scale multiplexing capability with insensitivity to spectral diffusion. This could enable entanglement generation over hundred kilometres of optical fiber at unprecedented rates.
[1] A. Reiserer, Rev. Mod. Phys. 94, 041003 (2022). [2] A. Reiserer, N. Kalb, G. Rempe & S. Ritter, Nature 508(7495), 237-240 (2014).
Keywords: quantum network; rare-earth emitter; spectral multiplexing; spectral diffusion; entanglement of distinguishable emitter