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arXiv quant-ph/0207146quant-ph
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保持部分转置正性操作下的纠缠代价

The entanglement cost under operations preserving the positivity of partial transpose

K. Audenaert, M. B. Plenio, J. Eisert

摘要:

我们研究了保留部分转置(PPT操作)的正性的量子操作下的纠缠代价。我们证明了这种成本与对数负性直接相关,从而为这种易于计算的纠缠度量提供了操作解释。作为例子,我们讨论了一般的维尔纳态和任意的二分高斯态。配备了这个结果,然后我们证明了反对称的Werner状态的PPT成本和PPT纠缠的蒸馏一致给出了第一个例子,一个真正的混合状态的纠缠操纵是渐近可逆的。

英文摘要:

We study the entanglement cost under quantum operations preserving the positivity of the partial transpose (PPT-operations). We demonstrate that this cost is directly related to the logarithmic negativity, thereby providing the operational interpretation for this easily computable entanglement measure. As examples we discuss general Werner states and arbitrary bi-partite Gaussian states. Equipped with this result we then prove that for the anti-symmetric Werner state PPT-cost and PPT-entanglement of distillation coincide giving the first example of a truly mixed state for which entanglement manipulation is asymptotically reversible.

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