期刊
PHYSICAL REVIEW A
卷 85, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.022334
关键词
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资金
- Research Fund for the Doctoral Program of Higher Education of China [20101402110012]
- International Cooperation Program in Sciences and Technology of Shanxi [2011081039]
- Natural Science Foundation of China [11171249, 11101250]
In this paper, we present a characterization of optimal entanglement witnesses in terms of positive maps and then provide a general method of checking optimality of entanglement witnesses. Applying it, we obtain indecomposable optimal witnesses that have no spanning property. These also provide examples that support a recent conjecture saying that the so-called structural physical approximations to optimal positive maps (optimal entanglement witnesses) give entanglement breaking maps (separable states).
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