4.6 Article

Device-independent quantum key distribution with single-photon sources

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QUANTUM
卷 4, 期 -, 页码 -

出版社

VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF
DOI: 10.22331/q-2020-04-30-260

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资金

  1. ERC CoG QITBOX
  2. ERC AdG CERQUTE
  3. Spanish MINECO [SEV-2015-0522]
  4. Fundacio Cellex and Mir-Puig
  5. AXA Chair in Quantum Information Science
  6. Generalitat de Catalunya [SGR1381]
  7. Generalitat de Catalunya (CERCA Program)
  8. Royal Society (URF UHQT)
  9. EU Quantum Flagship project QRANGE
  10. EU Quantum Flagship project CiviQ
  11. Foundation for Polish Science under the Quantum Optical Technologies project within the International Research Agendas programme - European Union under the European Regional Development Fund

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Device-independent quantum key distribution protocols allow two honest users to establish a secret key with minimal levels of trust on the provider, as security is proven without any assumption on the inner working of the devices used for the distribution. Unfortunately, the implementation of these protocols is challenging, as it requires the observation of a large Bell-inequality violation between the two distant users. Here, we introduce novel photonic protocols for device-independent quantum key distribution exploiting single-photon sources and heralding-type architectures. The heralding process is designed so that transmission losses become irrelevant for security. We then show how the use of single-photon sources for entanglement distribution in these architectures, instead of standard entangled-pair generation schemes, provides significant improvements on the attainable key rates and distances over previous proposals. Given the current progress in single-photon sources, our work opens up a promising avenue for device-independent quantum key distribution implementations.

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