Quantum Information Processing, Volume (16), No (5), Year (2016-5) , Pages (1999-2020)

Title : ( Revealing quantum correlation by negativity of the Wigner function )

Authors: razieh taghiabadi , Seyed Javad Akhtarshenas , Mohsen Sarbishaei ,

Citation: BibTeX | EndNote

We analyze two two-mode continuous variable separable states with the same marginal states. We adopt the definition of classicality in the form of welldefined positive Wigner function describing the state and find that although the states possess positive local Wigner functions, they exhibit negative Wigner functions for the global states. Using the negativity of Wigner function as an indicator of nonclassicality, we show that despite these states possess different negativities of the Wigner function, they do not reveal this difference as phase space nonclassicalities such as negativity of theMandel Q parameter or quadrature squeezing.We then concentrate on quantum correlation of these states and show that quantum discord and local quantum uncertainty, as two well-defined measures of quantum correlation, manifest the difference between negativity of theWigner functions. The non-Gaussianity of these states is also examined and show that the difference in behavior of their non-Gaussianity is the same as the difference between negativity of their Wigner functions. We also investigate the influence of correlation rank criterion and find that when the states can be produced locally from classical states, the Wigner functions cannot reveal their quantum correlations.

Keywords

Quantum correlation; Continuous variable state; Wigner
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@article{paperid:1056574,
author = {Taghiabadi, Razieh and Akhtarshenas, Seyed Javad and Sarbishaei, Mohsen},
title = {Revealing quantum correlation by negativity of the Wigner function},
journal = {Quantum Information Processing},
year = {2016},
volume = {16},
number = {5},
month = {May},
issn = {1570-0755},
pages = {1999--2020},
numpages = {21},
keywords = {Quantum correlation; Continuous variable state; Wigner function},
}

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%0 Journal Article
%T Revealing quantum correlation by negativity of the Wigner function
%A Taghiabadi, Razieh
%A Akhtarshenas, Seyed Javad
%A Sarbishaei, Mohsen
%J Quantum Information Processing
%@ 1570-0755
%D 2016

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