Experimental quantum key distribution at 1.3 gigabit-per-second secret-key rate over a 10 dB loss channel

Zheshen Zhang, Changchen Chen, Quntao Zhuang, Franco N.C. Wong, Jeffrey H. Shapiro

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Quantum key distribution (QKD) enables unconditionally secure communication ensured by the laws of physics, opening a promising route to security infrastructure for the coming age of quantum computers. QKD's demonstrated secret-key rates (SKRs), however, fall far short of the gigabit-per-second rates of classical communication, hindering QKD's widespread deployment. QKD's low SKRs are largely due to existing single-photon-based protocols' vulnerability to channel loss. Floodlight QKD (FL-QKD) boosts SKR by transmitting many photons per encoding, while offering security against collective attacks. Here, we report an FL-QKD experiment operating at a 1.3 Gbit s -1 SKR over a 10 dB loss channel. To the best of our knowledge, this is the first QKD demonstration that achieves a gigabit-per-second-class SKR, representing a critical advance toward high-rate QKD at metropolitan-area distances.

Original languageEnglish (US)
Article number025007
JournalQuantum Science and Technology
Issue number2
StatePublished - Apr 2018
Externally publishedYes


  • coincidence counting
  • fiber-optic communications
  • homodyne detection
  • quantum communications
  • quantum cryptography

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering


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