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arXiv quant-ph/0112064quant-ph
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关于无限维量子系统中纠缠的量化

On the quantification of entanglement in infinite-dimensional quantum systems

Jens Eisert, Christoph Simon, Martin B. Plenio

摘要:

我们调查纠缠措施在无限维制度。首先,我们讨论了当二体系统的希尔伯特空间是无限维时可能出现的特殊性,最值得注意的是具有无穷纠缠熵的状态集在状态空间中是迹范数稠密的,这意味着在每个乘积态的任何邻域中存在任意强纠缠态。澄清这种违反直觉的性质的出发点是观察到,如果人们施加自然和物理上合理的约束,即平均能量从上到下是有界的,那么纠缠熵就变成了一个迹范数连续泛函。然后将考虑扩展到渐近极限,我们将证明一些渐近连续性。我们继续研究纠缠的形成和相对熵的纠缠在无限维设置。最后,我们证明了即使在有限平均能量的约束下,纠缠态在态空间中仍然是迹范数稠密的。

英文摘要:

We investigate entanglement measures in the infinite-dimensional regime. First, we discuss the peculiarities that may occur if the Hilbert space of a bi-partite system is infinite-dimensional, most notably the fact that the set of states with infinite entropy of entanglement is trace-norm dense in state space, implying that in any neighborhood of every product state there lies an arbitrarily strongly entangled state. The starting point for a clarification of this counterintuitive property is the observation that if one imposes the natural and physically reasonable constraint that the mean energy is bounded from above, then the entropy of entanglement becomes a trace-norm continuous functional. The considerations will then be extended to the asymptotic limit, and we will prove some asymptotic continuity properties. We proceed by investigating the entanglement of formation and the relative entropy of entanglement in the infinite-dimensional setting. Finally, we show that the set of entangled states is still trace-norm dense in state space, even under the constraint of a finite mean energy.

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