Nonexistence of entangled continuous-variable Werner states with positive partial transpose
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F14%3A33149980" target="_blank" >RIV/61989592:15310/14:33149980 - isvavai.cz</a>
Result on the web
<a href="http://journals.aps.org/pra/pdf/10.1103/PhysRevA.89.032315" target="_blank" >http://journals.aps.org/pra/pdf/10.1103/PhysRevA.89.032315</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.89.032315" target="_blank" >10.1103/PhysRevA.89.032315</a>
Alternative languages
Result language
angličtina
Original language name
Nonexistence of entangled continuous-variable Werner states with positive partial transpose
Original language description
We address an open question about the existence of entangled continuous- variable (CV) Werner states with positive partial transpose (PPT). We prove that no such state exists by showing that all PPT CV Werner states are separable. The separability follows by observing that these CV Werner states can be approximated by truncating the states into a finite-dimensional convex mixture of product states. In addition, the constituents of the product states comprise a generalized non-Gaussian measurement whichgives, rather surprisingly, a strictly tighter upper bound on quantum discord than photon counting. These results uncover the presence of only negative partial transpose entanglement and illustrate the complexity of more general nonclassical correlationsin this paradigmatic class of genuine non-Gaussian quantum states.
Czech name
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Czech description
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Classification
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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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review A
ISSN
1050-2947
e-ISSN
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Volume of the periodical
89
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
"032315-1"-"032315-8"
UT code for WoS article
000333179100004
EID of the result in the Scopus database
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