Entropic Entanglement Criteria for Continuous Variables
Stephen Patrick Walborn, Bruno G. Taketani, A. Salles, Fabricio Toscano, R. L. de Matos Filho · Physical Review Letters · 2009
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.