Relay-assisted quantum-key distribution over long atmospheric channels

Majid Safari, Murat Uysal

Research output: Contribution to journalArticlepeer-review


In this paper, we investigate a terrestrial relay-assisted scheme for a free-space quantum key distribution (QKD) system based on BB84 protocol. We consider the deployment of passive relays which simply redirect the qubits to the next relay node or to the receiver without performing any measurement or detection process. Based on a near-field analysis, we derive an upper bound on quantum bit error rate (QBER) of the relay-assisted QKD system. Our results demonstrate that the relay-assisted scheme is able to outperform point-to-point direct transmission for long link ranges in which turbulence effects are particularly degrading.

Original languageEnglish (US)
Pages (from-to)4508-4515
Number of pages8
JournalJournal of Lightwave Technology
Issue number20
StatePublished - Oct 15 2009


  • Free-space optics
  • Quantum-key distribution
  • Relay-assisted systems

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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