Physical Review X (Apr 2018)

Metropolitan Quantum Key Distribution with Silicon Photonics

  • Darius Bunandar,
  • Anthony Lentine,
  • Catherine Lee,
  • Hong Cai,
  • Christopher M. Long,
  • Nicholas Boynton,
  • Nicholas Martinez,
  • Christopher DeRose,
  • Changchen Chen,
  • Matthew Grein,
  • Douglas Trotter,
  • Andrew Starbuck,
  • Andrew Pomerene,
  • Scott Hamilton,
  • Franco N. C. Wong,
  • Ryan Camacho,
  • Paul Davids,
  • Junji Urayama,
  • Dirk Englund

Journal volume & issue
Vol. 8, no. 2
p. 021009


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Photonic integrated circuits provide a compact and stable platform for quantum photonics. Here we demonstrate a silicon photonics quantum key distribution (QKD) encoder in the first high-speed polarization-based QKD field tests. The systems reach composable secret key rates of 1.039 Mbps in a local test (on a 103.6-m fiber with a total emulated loss of 9.2 dB) and 157 kbps in an intercity metropolitan test (on a 43-km fiber with 16.4 dB loss). Our results represent the highest secret key generation rate for polarization-based QKD experiments at a standard telecom wavelength and demonstrate photonic integrated circuits as a promising, scalable resource for future formation of metropolitan quantum-secure communications networks.