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Q: Fachverband Quantenoptik und Photonik
Q 11: QuanTour I – Single Photons & Foundations
Q 11.4: Vortrag
Montag, 2. März 2026, 18:00–18:15, P 7
Advances in Quantum Light Generation for Quantum Communication at Telecom Wavelengths — •Robert Behrends1, Lucas Rickert1, Pratim K. Saha1, Mareike Lach1, Martin v. Helversen1, Nils D. Kewitz1, David Becker1, Jochen Kaupp2, Yorick Reum2, Tobias Huber-Loyola2, Sven Höfling2, Andreas Pfenning2, and Tobias Heindel3 — 1Institute of Physics and Astronomy, Technical University Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — 2Technische Physik, Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Department for Quantum Technology, Univeristät Münster, Germany
We present an ultra-fast quantum dot (QD) single-photon source in the telecom C-band, based on InAs/InAlGaAs QD integrated in a circular Bragg grating cavitiy. We observe record-short biexciton decay time of T1=68 ps under resonant two-photon-excitation (TPE), which allows us to generate highly indistinguishable single photons at clock rates > 1 GHz. The two-photon interference visibility of photons emitted via the biexciton-exciton transition was measured in a Hong-Ou-Mandel-type experiment to be 92.4% and 82.6% at clock rates of 100 MHz and 2.5 GHz, respectively. Applying stimulated TPE in the telecom C-Band for the first time, we show that the photon indistinguishability can be further enhanced for exciton photons. Our results show promises to advance QD-based implementations of quantum cryptography to unprecedentedly high clock rates at wavelengths suitable for large-scale fiber-optic networks.
Keywords: Quantum Dots; Quantum Communication; Quantum Key Distribution; Single Photon Sources