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Two Theorems on Calculating the Relative Entropy of Entanglement |
| WU Sheng-Jun1;WU Qiang2;ZHANG Yong-De1 |
| 1Laboratory of Quantum Communication and Quantum
Computation and Department of Modern Physics, University of Science and Technology of China, Hefei 230027 2Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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WU Sheng-Jun, WU Qiang, ZHANG Yong-De 2001 Chin. Phys. Lett. 18 160-162 |
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Abstract We present two theorems on calculating the relative entropy of entanglement. Theorem 1 is an extension of Vedral and Plenio's theorem (Phys. Rev. A 57 (1998) 1619) for pure states, which is useful for calculating the relative entropy of entanglement for all pure states as well as for a class of mixed states. Theorem 2 gives the relative entropy of entanglement for any bipartite state whose tripartite purification has two separable reduced bipartite states.
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| Keywords:
03.65.Bz
03.67.-a
65.50.+m
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Published: 01 February 2001
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