Detecting quantum correlations in separable systems
Quantum Physics
2013-01-01 v3
Abstract
Quantum correlations in composite and separable quantum systems are characterized by non-vanishing quantum discord. We demonstrate the necessary and sufficient conditions for existence of hermitian witness operators for quantum discord, bypassing the problem of non-convexity of the set of all classical states. We propose an example of a linear witness which can detect quantum correlations in large classes of separable bipartite systems. Decomposition of the witness in terms of a small number of locally measurable operators as shown here, paves the way for experimental detection of quantum correlations beyond entanglement.
Cite
@article{arxiv.1205.2098,
title = {Detecting quantum correlations in separable systems},
author = {S. Adhikari and A. S. Majumdar and I. Chakraborty},
journal= {arXiv preprint arXiv:1205.2098},
year = {2013}
}
Comments
This paper has been withdrawn due to an error