Phys. Rev. Lett. 98, 140505 (2007) [3 pages]Observable Entanglement Measure for Mixed Quantum StatesReceived 30 May 2006; published 4 April 2007 We quantify an unknown mixed quantum state’s entanglement by suitable, local parity measurements on its twofold copy. The associated observable qualifies as a generalized entanglement witness. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.140505
DOI:
10.1103/PhysRevLett.98.140505
PACS:
03.67.Mn
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