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

We investigate the connection between the optimal collective eavesdroppingattack and the optimal cloning attack where the eavesdropper employs an optimalcloner to attack the quantum key distribution (QKD) protocol. The analysis isdone in the context of the security proof in [Devetak and Winter, Proc. of theRoy. Soc. of London Series A, 461, 207 (2005); Kraus, Gisin and Renner, Phys.Rev. Lett. 95, 080501 (2005)] for discrete variable protocols in d-dimensionalHilbert spaces. We consider a scenario in which the protocols and cloners areequipped with symmetries. These symmetries are used to define a quantum cloningscenario. We find that, in general, it does not hold that the optimal attack isan optimal cloner. However, there are classes of protocols, where we canidentify an optimal attack by an optimal cloner. We analyze protocols with 2, dand d+1 mutually unbiased bases where d is a prime, and show that for theprotocols with 2 and d+1 MUBs the optimal attack is an optimal cloner, but forthe protocols with d MUBs, it is not. Finally, we give criteria to identifyprotocols which have different signal states, but the same optimal attack.Using these criteria, we present qubit protocols which have the same optimalattack as the BB84 protocol or the 6-state protocol.

Symmetries in Quantum Key Distribution and the Connection between Optimal Attacks and Optimal Cloning