UNIGE document Scientific Article
previous document  unige:84116  next document
add to browser collection

Provably secure and practical quantum key distribution over 307 km of optical fibre

Lim, Charles Ci Wen
Li, Ming Jun
Nolan, Daniel
show hidden authors show all authors [1 - 9]
Published in Nature photonics. 2015, vol. 9, no. 3, p. 163-168
Abstract Proposed in 1984, quantum key distribution (QKD) allows two users to exchange provably secure keys via a potentially insecure quantum channel1. Since then, QKD has attracted much attention and significant progress has been made both in theory and practice2, 3. On the application front, however, the operating distance of practical fibre-based QKD systems is limited to about 150 km (ref. 4), mainly due to the high background noise of practical single-photon detectors5, 6 and inefficient finite-key security analysis7, 8, 9. Here, we present, for the first time, a compact and autonomous QKD system that is capable of distributing provably secure cryptographic keys over 307 km of optical fibre. This is achieved by using semiconductor single-photon detectors with record low background noise10 and a novel finite-key security analysis, which is efficient even for short key lengths. This demonstrates the feasibility of practical long-distance QKD based on standard fibre-optic telecom components.
Full text
Article (Published version) (2.6 MB) - document accessible for UNIGE members only Limited access to UNIGE
Research groups Groupe Gisin
Groupe Zbinden
(ISO format)
KORZH, Boris et al. Provably secure and practical quantum key distribution over 307 km of optical fibre. In: Nature photonics, 2015, vol. 9, n° 3, p. 163-168. doi: 10.1038/nphoton.2014.327 https://archive-ouverte.unige.ch/unige:84116

604 hits



Deposited on : 2016-06-01

Export document
Format :
Citation style :