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arXiv quant-ph/0207031quant-ph
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二体混合态的渐近纠缠变换率:最大纠缠态不是特殊的

Rates of asymptotic entanglement transformations for bipartite mixed states: Maximally entangled states are not special

Michal Horodecki, Aditi Sen De, Ujjwal Sen

摘要:

研究了两体混合态纠缠变换的局域操作和经典通信(LOCC)的渐近速率。我们分析了不同跃迁速率之间的关系,得到了这些跃迁的简单的上、下界。在从一个混合状态到另一个混合状态的转变中,不可逆性的量对于不同的目标状态可以是不同的。这样,我们就自然地得到了纠缠的渐近操纵中不可逆性的“量”的概念。我们调查的行为,这些转化率为不同的目标状态。我们证明了在LOCC条件下,最大纠缠态的渐近跃迁率并没有特殊的地位。在这个过程中,我们得到了对于所有的最大关联态,形成纠缠是可加的。这使我们能够在2x2的最大关联态的渐近纠缠操纵中显示不可逆性。我们表明,可能的不平等的可分割的纠缠下LOCC和操作下保持部分换位的积极性,是有关的行为的过渡(下LOCC)可分离的目标状态。

英文摘要:

We investigate the asymptotic rates of entanglement transformations for bipartite mixed states by local operations and classical communication (LOCC). We analyse the relations between the rates for different transitions and obtain simple lower and upper bound for these transitions. In a transition from one mixed state to another and back, the amount of irreversibility can be different for different target states. Thus in a natural way, we get the concept of "amount" of irreversibility in asymptotic manipulations of entanglement. We investigate the behaviour of these transformation rates for different target states. We show that with respect to asymptotic transition rates under LOCC, the maximally entangled states do not have a special status. In the process, we obtain that the entanglement of formation is additive for all maximally correlated states. This allows us to show irreversibility in asymptotic entanglement manipulations for maximally correlated states in 2x2. We show that the possible nonequality of distillable entanglement under LOCC and that under operations preserving the positivity of partial transposition, is related to the behaviour of the transitions (under LOCC) to separable target states.

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