Redundancy and Synergy of an Entangling Cloner in Continuous-Variable Quantum Communication

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F22%3A73614634" target="_blank" >RIV/61989592:15310/22:73614634 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/1099-4300/24/10/1501" target="_blank" >https://www.mdpi.com/1099-4300/24/10/1501</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/e24101501" target="_blank" >10.3390/e24101501</a>

Result language
angličtina
Original language name
Redundancy and Synergy of an Entangling Cloner in Continuous-Variable Quantum Communication
Original language description
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.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
<a href="/en/project/GF21-44815L" target="_blank" >GF21-44815L: Secure quantum communication in multiplexed optical networks</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)