Abstract
We present a quantum key distribution system with a 2.5 GHz repetition rate using a three-state time-bin protocol combined with a one-decoy approach. Taking advantage of superconducting single-photon detectors optimized for quantum key distribution and ultralow-loss fiber, we can distribute secret keys at a maximum distance of 421 km and obtain secret key rates of 6.5 bps over 405 km.
- Received 10 July 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.190502
© 2018 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Record Distance for Quantum Cryptography
Published 5 November 2018
An optical-fiber-based quantum cryptography scheme works over a record distance of 421 km and at much faster rates than previous long-distance demonstrations.
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