Entanglement detection: Linear entropy versus Bell-CHSH inequality
Abstract
The relation between the violation of the Bell-CHSH inequalities and entanglement properties of quantum states is not clear so one may consider the mixedness of the system to understand the entanglement properties better than the Bell-CHSH inequality. In this respect, we prove that if the mixedness of the state measured by the linear entropy is less than 2/3 but strictly greater than zero then the two qubit states are entangled. But if the linear entropy is greater or equal to 2/3 then the state may or may not be entangled. Further we show that our entanglement criterion detects larger set of entangled state than Bell-CHSH inequality and Santos's entropic criterion [Phys. Rev. A 69, 022305 (2004)]. Lastly we illustrate our result by citing few examples.
Cite
@article{arxiv.0906.1906,
title = {Entanglement detection: Linear entropy versus Bell-CHSH inequality},
author = {Satyabrata Adhikari},
journal= {arXiv preprint arXiv:0906.1906},
year = {2009}
}
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9 pages