Deterministic and highly indistinguishable single photons in the telecom C-band

• URL: http://arxiv.org/abs/2505.09695v1
• Date: Wed, 14 May 2025 18:00:23 GMT
• Title: Deterministic and highly indistinguishable single photons in the telecom C-band
• Authors: Nico Hauser, Matthias Bayerbach, Jochen Kaupp, Yorick Reum, Giora Peniakov, Johannes Michl, Martin Kamp, Tobias Huber-Loyola, Andreas T. Pfenning, Sven Höfling, Stefanie Barz,
• Abstract summary: We report a quantum dot-based single-photon source operating in the telecommunications C-band.<n>This is the first demonstration of two-photon interference visibility exceeding 90% from a quantum-dot emitter.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum dots are promising candidates for deterministic single-photon sources, yet achieving high photon indistinguishability at telecom wavelengths remains a critical challenge. Here, we report a quantum dot-based single-photon source operating in the telecommunications C-band that achieves a raw two-photon interference visibility of up to (91.7+-0.2)%, thus setting a new benchmark for indistinguishability in this spectral range. The device consists of an indium arsenide (InAs) quantum dot embedded within indium aluminum gallium arsenide (InAlGaAs) and integrated into a circular Bragg grating resonator. We explore multiple optical excitation schemes to optimize coherence and source performance. To our knowledge, this is the first demonstration of two-photon interference visibility exceeding 90% from a quantum-dot emitter in the telecommunications C-band, advancing the viability of solid-state sources for quantum communication and photonic networks.

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