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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The four-state continuous-variable quantum key distribution (CVQKD) protocolhas a long practical secure distance \cite{Leverrier_PRL_2009}, while it hasthe difficulty of parameter estimation. We propose an improved four-stateprotocol, where the covariance matrix can be estimated from experimental datawithout using the linear channel assumption, and thus ensuring itsunconditional security in the asymptotical limit. Our new scheme keeps theadvantages of high reconciliation efficiency and long secure distance of thefour-state protocol, and it can be implemented under current technology.

Improved Four-state Continuous-variable Quantum Key Distribution with Long Secure Distance