Nonclassicality in phase space and nonclassical correlation
Quantum Physics
2009-05-15 v3
Abstract
Continuous variable entanglement is a manifestation of nonclassicality of quantum states. In this paper we attempt to analyze whether and under which conditions nonclassicality can be used as an entanglement criterion. We adopt the well-accepted definition of nonclassicality in the form of lack of well-defined positive Glauber Sudarshan P-function describing the state. After demonstrating that the classicality of subsystems is not sufficient for the nonclassicality of the overall state to be identifiable with entanglement, we focus on Gaussian states and find specific local unitary transformations required to arrive at this equivalency. This is followed by the analysis of quantitative relation between nonclassicality and entanglement.
Cite
@article{arxiv.0705.3217,
title = {Nonclassicality in phase space and nonclassical correlation},
author = {Petr Marek and M. S. Kim and Jinhyoung Lee},
journal= {arXiv preprint arXiv:0705.3217},
year = {2009}
}