Entropic entanglement criteria for continuous variables.

@article{Walborn2009EntropicEC,
  title={Entropic entanglement criteria for continuous variables.},
  author={S. Walborn and B. G. Taketani and A. Salles and F. Toscano and R. L. de Matos Filho},
  journal={Physical review letters},
  year={2009},
  volume={103 16},
  pages={
          160505
        }
}
We derive several entanglement criteria for bipartite continuous variable quantum systems based on the Shannon entropy. These criteria are more sensitive than those involving only second-order moments, and are equivalent to well-known variance product tests in the case of Gaussian states. Furthermore, they involve only a pair of quadrature measurements, and will thus prove extremely useful in the experimental identification of entanglement. 
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