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arXiv quant-ph/0303140quant-ph
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超选择规则约束下的纠缠

Entanglement constrained by superselection rules

Stephen D. Bartlett, H. M. Wiseman

摘要:

如果对允许的局部操作有限制,则可以减少二分纠缠。我们引入广义超选择规则(SSR)的概念来描述这种限制,并对受其约束的纠缠进行量化.我们证明了系综量子信息处理(其中系综中的元素不能单独寻址)受制于与对称群(元素排列群)相关的SSR.我们证明,即使是一个合奏包括许多对量子比特,每对描述的一个纯贝尔状态,每个元素的纠缠限制这个SSR去为零的大量元素。

英文摘要:

Bipartite entanglement may be reduced if there are restrictions on allowed local operations. We introduce the concept of a generalized superselection rule (SSR) to describe such restrictions, and quantify the entanglement constrained by it. We show that ensemble quantum information processing, where elements in the ensemble are not individually addressable, is subject to the SSR associated with the symmetric group (the group of permutations of elements). We prove that even for an ensemble comprising many pairs of qubits, each pair described by a pure Bell state, the entanglement per element constrained by this SSR goes to zero for a large number of elements.

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