Paper Info
Title
Redundancy and Synergy of an Entangling Cloner in Continuous-Variable Quantum Communication
Abstract
We address minimization of information leakage from continuous-variable quantum channels. It is known, that regime of minimum leakage can be accessible for the modulated signal states with variance equivalent to a shot noise, i.e., vacuum fluctuations, in the case of collective attacks. Here we derive the same condition for the individual attacks and analytically study the properties of the mutual information quantities in and out of this regime. We show that in such regime a joint measurement on the modes of a two-mode entangling cloner, being the optimal individual eavesdropping attack in a noisy Gaussian channel, is no more effective that independent measurements on the modes. Varying variance of the signal out of this regime, we observe the nontrivial statistical effects of either redundancy or synergy between the measurements of two modes of the entangling cloner. The result reveals the non-optimality of entangling cloner individual attack for sub-shot-noise modulated signals. Considering the communication between the cloner modes, we show the advantage of knowing the residual noise after its interaction with the cloner and extend the result to a two-cloner scheme.
Year
DOI
Venue
2022
10.3390/e24101501
ENTROPY
Keywords
DocType
Volume
quantum communication, continuous variables, quantum entanglement, quantum key distribution, entangling cloner
Journal
24
Issue
ISSN
Citations 
10
1099-4300
0
PageRank 
References 
Authors
0.34
0
1
Name
Order
Citations
PageRank
Vladyslav C. Usenko1528.53