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Abstract: The work by Christandl, K\-onig and Renner Phys. Rev. Lett. 102, 0205042009 provides in particular the possibility of studying unconditionalsecurity in the finite-key regime for all discrete-variable protocols. We spellout this bound from their general formalism. Then we apply it to the study of arecently proposed protocol Laing et al., Phys. Rev. A 82, 012304 2010. Thisprotocol is meaningful when the alignment of Alice-s and Bob-s reference framesis not monitored and may vary with time. In this scenario, the notion ofasymptotic key rate has hardly any operational meaning, because if one waitstoo long time, the average correlations are smeared out and no security can beinferred. Therefore, finite-key analysis is necessary to find the maximalachievable secret key rate and the corresponding optimal number of signals.



Autor: Lana Sheridan, Thinh Phuc Le, Valerio Scarani

Fuente: https://arxiv.org/







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