Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F12%3A33140114" target="_blank" >RIV/61989592:15310/12:33140114 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/1367-2630/14/9/093048" target="_blank" >http://dx.doi.org/10.1088/1367-2630/14/9/093048</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1367-2630/14/9/093048" target="_blank" >10.1088/1367-2630/14/9/093048</a>

Result language
angličtina
Original language name
Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
Original language description
Entanglement properties of Gaussian states of light as well as the security of continuous variable quantum key distribution with Gaussian states in free-space fading channels are studied. These qualities are shown to be sensitive to the statistical properties of the transmittance distribution in the cases when entanglement is strong or when channel excess noise is present. Fading, i.e. transmission fluctuations, caused by beam wandering due to atmospheric turbulence, is a frequent challenge in free-space communication. We introduce a method of fading discrimination and subsequent post-selection of the corresponding sub-states and show that it can improve the entanglement resource and restore the security of the key distribution over a realistic fadinglink. Furthermore, the optimal post-selection strategy in combination with an optimized entangled resource is shown to drastically increase the protocol's robustness to excess noise, which is confirmed for experimentally measured fading c
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Project
<a href="/en/project/GPP205%2F10%2FP321" target="_blank" >GPP205/10/P321: Continuous variable quantum key broadcasting</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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