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arXiv 1609.01698quant-ph
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量子态中的量子束缚纠缠

Quantitative bound entanglement in two-qutrit states

Gael Sentís, Christopher Eltschka, Jens Siewert

摘要:

在量子关联的诸多方面中,束缚纠缠一直是最神秘的现象之一,尽管它在量子信息的早期就被发现了。即使是它的检测已被证明是困难的,更不用说其精确的定量表征。在这篇工作中,我们提出了一个两参数族的高度对称的两个quutrit混合态的纠缠的精确量化,其中包含了相当大的一部分束缚纠缠态。我们通过明确计算线性熵的凸屋顶扩展以及家庭内每个状态的并发来实现这一点。我们的研究结果提供了一个基准,为未来的定量研究在高维系统中的两体纠缠。

英文摘要:

Among the many facets of quantum correlations, bound entanglement has remained one the most enigmatic phenomena, despite the fact that it was discovered in the early days of quantum information. Even its detection has proven to be difficult, let alone its precise quantitative characterization. In this work, we present the exact quantification of entanglement for a two-parameter family of highly symmetric two-qutrit mixed states, which contains a sizable part of bound entangled states. We achieve this by explicitly calculating the convex-roof extensions of the linear entropy as well as the concurrence for every state within the family. Our results provide a benchmark for future quantitative studies of bipartite entanglement in higher-dimensional systems.

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