Purification and correlated measurements of bipartite mixed states
| Authors | |
|---|---|
| Year of publication | 2002 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review A |
| MU Faculty or unit | |
| Citation | |
| Field | Informatics |
| Keywords | quantum information theory; entanglement; separability; factorability |
| Description | We prove that all purifications of a nonfactorable state (i.e., the state that cannot be expressed in a form $\rho_{AB}=\rho_A\otimes\rho_B$) are entangled. We also show that for any bipartite state there exists a pair of measurements that are correlated on this state if and only if the state is nonfactorable. |
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