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arXiv 2409.07646quant-phmath-phmath.MPmath.OA
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纠缠的多方窃取

Multipartite Embezzlement of Entanglement

Lauritz van Luijk, Alexander Stottmeister, Henrik Wilming

AI总结:

本文研究了多方系统中纠缠的窃取问题,证明了多方窃取态的有限维近似构成多方窃取族,并提出了确保窃取族收敛于窃取态的一致性条件,最终在交换的III$_1$因子构成的多方系统上实现了任意态皆为窃取态。

摘要:

纠缠的窃取是指通过局部操作且无需通信,从纠缠资源中提取纠缠,同时将资源的扰动保持在任意小的范围内的任务。最近,证明了 III 型冯·诺依曼代数(von Neumann algebras)的二部系统窃取态的存在性。然而,多方情况以及窃取态与 van Dam 和 Hayden 最初定义的窃取族概念之间的精确关系仍未解决。在这里,我们证明了多方窃取态的有限维近似构成了多方窃取族。相比之下,并非每个窃取族都收敛于窃取态。我们确定了一个额外的一致性条件,以确保窃取族收敛于窃取态。该准则区分了 van Dam 和 Hayden 的窃取族与 Leung、Toner 和 Watrous 的窃取族。后者可推广至多方设置。通过取极限,我们得到了一个由交换的 III$_1$ 因子组成的多方系统,在该系统上每个态都是窃取态。我们在量子场论和量子多体物理的背景下讨论了我们的结果。作为开放性问题,我们询问多于两个时空维度的相对论性量子场的真空是否为多方窃取态,以及多方窃取是否允许算子代数刻画。

英文摘要:

Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via local operations and without communication while perturbing the resource arbitrarily little. Recently, the existence of embezzling states of bipartite systems of type III von Neumann algebras was shown. However, both the multipartite case and the precise relation between embezzling states and the notion of embezzling families, as originally defined by van Dam and Hayden, was left open. Here, we show that finite-dimensional approximations of multipartite embezzling states form multipartite embezzling families. In contrast, not every embezzling family converges to an embezzling state. We identify an additional consistency condition that ensures that an embezzling family converges to an embezzling state. This criterion distinguishes the embezzling family of van Dam and Hayden from the one by Leung, Toner, and Watrous. The latter generalizes to the multipartite setting. By taking a limit, we obtain a multipartite system of commuting type III$_1$ factors on which every state is an embezzling state. We discuss our results in the context of quantum field theory and quantum many-body physics. As open problems, we ask whether vacua of relativistic quantum fields in more than two spacetime dimensions are multipartite embezzling states and whether multipartite embezzlement allows for an operator-algebraic characterization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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