Work

Correlation-based entanglement criteria for bipartite systems

Year: 2017

Type: article

Abstract: We introduce a class of inequalities based on low-order correlations of operators to detect entanglement in bipartite systems. The operators may either be Hermitian or non-Hermitian and are applicable to any physical system or class of states. Testing the criteria on example systems reveals that they outperform other common correlation-based criteria, such as those by Duan-Giedke-Cirac-Zoller and Hillery-Zubairy. One unusual feature of the criteria is that the correlations include the density matrix itself, which is related to the purity of the system. We discuss how such a term could be measured in relation to the criteria.

Source: Physical Review A

DOI: 10.1103/physreva.95.052305

Authors: Yumang Jing, Qiongyi He, Tim Byrnes