Conditional entropies and their relation to entanglement criteria
- 1 September 2002
- journal article
- research article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 43 (9) , 4299-4306
- https://doi.org/10.1063/1.1498490
Abstract
We discuss conditional Rényi and Tsallis entropies for bipartite quantum systems of finite dimension. We investigate the relation between the positivity of conditional entropies and entanglement properties. It is in particular shown that any state having a negative conditional entropy with respect to any value of the entropic parameter is distillable since it violates the reduction criterion. Moreover, we show that the entanglement of Werner states in odd dimensions can neither be detected by entropic criteria nor by any other spectral criterion.Keywords
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