English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Proposed in 1984, quantum key distribution (QKD) allows two users to exchangeprovably secure keys via a potentially insecure quantum channel. Since then,QKD has attracted much attention and significant progress has been made in boththeory and practice. On the application front, however, the operating distanceof practical fibre-based QKD systems is limited to about 150 km, which ismainly due to the high background noise produced by commonly used semiconductorsingle-photon detectors (SPDs) and the stringent demand on the minimumclassical- post-processing (CPP) block size. Here, we present a compact andautonomous QKD system that is capable of distributing provably-securecryptographic key over 307 km of ultra-low-loss optical fibre (51.9 dB loss).The system is based on a recently developed standard semiconductor (inGaAs)SPDs with record low background noise and a novel efficient finite-key securityanalysis for QKD. This demonstrates the feasibility of practical long-distanceQKD based on standard fibre optic telecom components.

Provably Secure and Practical Quantum Key Distribution over 307 km of Optical Fibre