Quantum key distribution with entanglement-swapped photons from a quantum emitter
Year: 2026
Type: article
Abstract: Quantum key distribution (QKD) is a fundamental functionality of quantum networks. Extending its range requires quantum repeaters, a technology still under development and not yet demonstrated in combination with quantum cryptographic protocols. Here, we address the elementary operation of a viable quantum repeater scheme by evaluating whether correlated photons distributed via entanglement swapping can support secret key distribution. We employ a state-of-the-art deterministic photon source based on a strain-tuned GaAs quantum dot embedded in a photonic cavity and implement a source-independent QKD protocol between two nodes using entanglement-swapped photons. We benchmark the system and present how high-resolution temporal postselection can enable secure key exchange, with further rate improvements expected through realistic device and protocol optimizations. Due to its compatibility with a wide range of quantum memory platforms, our approach represents a significant step toward long-distance quantum-safe communication.
Source: Physical Review Research
DOI: 10.1103/68f1-cjfk
Authors: Michele B. Rota, Francesco Basso Basset, Alessandro Laneve, Francesco Salusti, Nicolas Claro-Rodriguez, Giuseppe Ronco, Mattia Beccaceci, Tobias M. Krieger, Quirin Buchinger, Saimon F. Covre da Silva, Sandra Stroj, Mariia Gumberidze, Vladyslav Usenko, Sven Höfling, Tobias Huber-Loyola, Mario A. Usuga Castaneda, Armando Rastelli, Klaus D. Jöns, Rinaldo Trotta
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Funders: European Commission, Fundação de Amparo à Pesquisa do Estado de São Paulo, Grantová Agentura České Republiky, Bundesministerium für Bildung und Forschung, Austrian Science Fund, QuantERA, Ministero dell'Università e della Ricerca, HORIZON EUROPE Framework Programme, European Research Council
Awards: G1171162939, G1648780019, G2361878796, G388252207, G5443090575, G575169067, G5784736367, QuantERA II ERA-NET Cofund in Quantum Technologies, European Photonic Quantum Computer, Quantum Repeaters using On-demand Photonic Entanglement, G6225469397, G6251103608, G6706401475, G6769686316, G7424533547, G7711030316, Quantum Secure Networks Partnership
OpenAlex ID: W7167629431