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Quantum 2.0 Conference and Exhibition

Quantum interference between two independent sources in telecommunication band

Mathis Cohen, Romain Dalidet, Florian Pastier, Valérian Giesz, Niccolò Somaschi, P. Senellart, Sarah E. Thomas, Anthony Martin, Sébastien Tanzilli, Laurent Labonté

Published Jan 1, 2022• 0 citations
Publisher

Abstract

We report a raw quantum interference visibility of 90 ± 1% between telecom photons emitted by a weak coherent state source (WCSS) and an entangled photon pair source (EPPS).
DOI
10.1364/quantum.2022.qtu3b.5

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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.