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Quantum key distribution with entanglement-swapped photons from a quantum emitter

Michele B. Rota1,*,†, Francesco Basso Basset1,2,*, Alessandro Laneve1, Francesco Salusti3, Nicolas Claro-Rodriguez3, Giuseppe Ronco1, Mattia Beccaceci1, Tobias M. Krieger4, Quirin Buchinger5 et al.

Saimon F. Covre da Silva4,6, Sandra Stroj7, Mariia Gumberidze8, Vladyslav Usenko8, Sven Höfling5, Tobias Huber-Loyola5,9,10, Mario A. Usuga Castaneda11, Armando Rastelli4, Klaus D. Jöns3, and Rinaldo Trotta1,‡

  • *These authors contributed equally to this work.
  • †Contact author: michele.rota@uniroma1.it
  • ‡Contact author: rinaldo.trotta@uniroma1.it
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Phys. Rev. Research 8, 043096 – Published 29 October, 2026

DOI: https://doi.org/10.1103/68f1-cjfk

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.

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Phys. Rev. Research 8, 043096– Published 29 October, 2026
  • Received 30 November 2025
  • Accepted 7 July 2026
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