Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Quantum Communication, Networks, Repeaters, & QKD I
Q 49.6: Vortrag
Donnerstag, 5. März 2026, 12:15–12:30, P 10
Purcell-Enhanced Er3+ Dopants in Silicon Nanophotonics for Quantum Networks — •Francesca Molteni, Andreas Gritsch, Jakob Pforr, Benedikt Braumandl, Alexander Ulanowski, Arantza Pineda Gonzalez, and Andreas Reiserer — Technical University of Munich, TUM School of Natural Sciences, Physics Department and Munich Center for Quantum Science and Technology (MCQST), James-Franck-Straße 1, 85748 Garching, Germany
Erbium in silicon provides a promising route towards scalable quantum networks, offering telecom-band emission compatible with low-loss fibers and narrow transitions [1], while enabling the integration of quantum emitters into photonic circuits [2].
We investigate Er3+ dopants in a silicon-on-insulator platform, where on-chip photonic crystal cavities produce strong Purcell enhancement via high Q factors and sub-wavelength mode volumes. This enables fast spin initialization and optical single-shot readout [3].
Optical coherence is probed through Rabi oscillations and photon-echo measurements, revealing coherence times exceeding 80 % of the lifetime limit and interference of sequentially emitted photons demonstrates high indistinguishability. We will present recent advances that allow for increased Purcell enhancement factors.
These results establish erbium in silicon as a highly promising and scalable platform for future quantum network architectures.
[1] Reiserer, Rev. Mod. Phys. 94, 041003 (2022); [2] Gritsch et al., Phys. Rev. X 12 (4), 041009 (2022); [3] Gritsch et al., Nat. Commun. 16, 64 (2025).
Keywords: Quantum networks; Rare-earth emitters; Purcell enhancement; Spin Qubits