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arXiv quant-ph/0310027quant-ph
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凸顶扩展负性作为二体量子系统的纠缠度量

Convex-roof extended negativity as an entanglement measure for bipartite quantum systems

Soojoon Lee, Dong Pyo Chi, Sung Dahm Oh, Jaewan Kim

摘要:

利用凸屋顶扩展的方法,我们将两体纯态纠缠的一个很好的度量--负性的概念推广到混合态。利用Vollbrecht和Werner [Phys. Rev. A { \bf 64},062307(2001)]提出的形式,我们证明了在局域量子操作和经典通信下纠缠度不增加,并推导了各向同性态和Werner态的纠缠度的显式公式.

英文摘要:

We extend the concept of the negativity, a good measure of entanglement for bipartite pure states, to mixed states by means of the convex-roof extension. We show that the measure does not increase under local quantum operations and classical communication, and derive explicit formulae for the entanglement measure of isotropic states and Werner states, applying the formalism presented by Vollbrecht and Werner [Phys. Rev. A {\bf 64}, 062307 (2001)].

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