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arXiv 2402.13489quant-ph
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任意维度多体量子态的局域酉等价

Local unitary equivalence of arbitrary-dimensional multipartite quantum states

Qing Zhou, Yi-Zheng Zhen, Xin-Yu Xu, Shuai Zhao, Wen-Li Yang, Shao-Ming Fei, Li Li, Nai-Le Liu, Kai Chen

AI总结:

本文基于广义 Bloch 表示的系数矩阵构造任意维度两体及多体量子态的局域酉不变量,并将其用于验证局域酉等价和估计并发度。

摘要:

局域酉等价是量化和分类纠缠的重要要素。验证两个量子态是否局域酉等价是一个关键问题,其中目前只有多体纯态的情形得到了解决。然而,对于混合态,局域酉等价的验证仍然是一个具有挑战性的问题。在本文中,基于量子态广义 Bloch 表示的系数矩阵,我们为任意维度 bipartite(两体)量子态找到了一系列局域酉不变量。这些不变量是可操作的,可以用作验证两个量子态局域酉等价的必要条件。此外,我们将该构造推广到任意维度 multipartite(多体)情形。最后,我们应用这些不变量来估计 concurrence(并发度)——一种重要的纠缠度量,展示了局域酉不变量在刻画纠缠方面的实用性。

英文摘要:

Local unitary equivalence is an important ingredient for quantifying and classifying entanglement. Verifying whether or not two quantum states are local unitary equivalent is a crucial problem, where only the case of multipartite pure states is solved. For mixed states, however, the verification of local unitary equivalence is still a challenging problem. In this paper, based on the coefficient matrices of generalized Bloch representations of quantum states, we find a variety of local unitary invariants for arbitrary-dimensional bipartite quantum states. These invariants are operational and can be used as necessary conditions for verifying the local unitary equivalence of two quantum states. Furthermore, we extend the construction to the arbitrary-dimensional multipartite case. We finally apply these invariants to estimate concurrence, a vital entanglement measure, showing the practicability of local unitary invariants in characterizing entanglement.

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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