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Quantifying Quantum Entanglement.

Quantum entanglement has played a very important role in quantum information theory; it provides strong tests of quantum nonlocality as well as a useful resource for various kinds of quantum information processing. It is really important to describe quantum entanglement both qualitatively and quantitatively. What kinds of states are entangled? To answer this question, we present a necessary and sufficient criterion for multipartite entangled states; this criterion is particularly useful when the density matrix of the given quantum states has few nonzero eigenvalues. If a quantum state is entangled, then, how much entanglement does it contain? It will be shown that, a scalar number cannot quantify quantum entanglement, unlike temperature. The entanglement types and possible ways for entanglement quantification will also be discussed.
Snengjun Wu
Department of Physics and Astronomy
University of South Carolina, Columbia
COPYRIGHT 2001 South Carolina Academy of Science
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Copyright 2001 Gale, Cengage Learning. All rights reserved.

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Author:Wu, Snengjun
Publication:Bulletin of the South Carolina Academy of Science
Article Type:Brief Article
Geographic Code:1USA
Date:Jan 1, 2001
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