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THU: Thursday Contributed Sessions

THU 5: QIP Implementations: Interfaces

THU 5.3: Talk

Thursday, September 11, 2025, 14:45–15:00, ZHG010

Single erbium dopants in silicon resonators — •Benedikt Braumandl, Andreas Gritsch, Jakob Pforr, Alexander Ulanowski, Arantza Pineda Gonzalez, and Andreas Reiserer — Technical University of Munich, TUM School of Natural Sciences and Munich Center for Quantum Science and Technology (MCQST), 85748 Garching, Germany

Establishing long-distance quantum networks requires not only low-loss photon transmission, but also efficient, scalable interfaces between stationary and flying qubits. One promising approach leverages rare-earth ions, whose optical transitions lie directly in the telecom band, ensuring compatibility with existing fiber infrastructure [1]. In particular, erbium dopants in silicon offer a robust route to integrating quantum emitters with photonic circuitry, combining telecom-wavelength emission with the scalability of silicon nanotechnology [2].

We investigate the optical coherence of single erbium dopants embedded in high-Q silicon nanophotonic resonators, where Purcell enhancement enables efficient coupling between the emitter and photonic modes [3]. We further evaluate photon indistinguishability via Hong--Ou--Mandel-type interferometry, observing high visibility at short time delays. This demonstrates the emitter's suitability for photon-mediated entanglement protocols between distant qubits.

[1] Reiserer, A. Rev. Mod. Phys. 94, 041003 (2022)

[2] Gritsch, A. et. al. Phys. Rev. X 12 (4): 041009 (2022)

[3] Gritsch, A. et. al. Nat Commun 16, 64 (2025)

Keywords: Quantum networks; Rare-earth emitters; Purcell enhancement