Phys. Rev. Lett. 89, 127902 (2002) [4 pages]Method for Direct Detection of Quantum EntanglementReceived 7 February 2002; published 30 August 2002 Basing on positive maps separability criterion we propose the experimentally viable, direct detection of quantum entanglement. It is efficient and does not require any a priori knowledge about the state. For two qubits it provides a sharp (i.e., “if and only if”) separability test and estimation of amount of entanglement. We view this method as a new form of quantum computation, namely, as a decision problem with quantum data structure. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.127902
DOI:
10.1103/PhysRevLett.89.127902
PACS:
03.65.Ud, 03.65.Wj, 03.67.Lx
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