近日，印度理工学院的R. Prabhu及其研究团队取得一项新进展。经过不懈努力，他们揭示具有二体和三体相互作用的多体自旋系统中量子关联的可共享性。相关研究成果已于2024年3月21日在国际知名学术期刊《物理评论A》上发表。

该研究团队从纠缠可分性和信息论两个维度，深入探讨了包含两体和三体相互作用的多方量子自旋系统中量子关联的可共享性。这些相互作用受到系统参数和外部磁场的共同影响。研究发现，该系统中的单配性分数呈现出单配性和非单配性的双重特征，这主要取决于量子关联测量方式、系统参数的强度以及外部磁场的状况。在变量允许的范围内，当采用信息论量子关联进行分析时，非单配性状态的占比高于纠缠可分性状态。此外，研究团队还确定了非单配性状态转变为单配性的量子关联测度的积分幂。

据悉，多方量子系统的组成部分间，量子关联的共享能力受到量子信息理论中“单配性”这一核心概念的制约。而根据多方量子系统的不同特性，量子关联性的测量方法也呈现出多样化的单配性特征。

附：英文原文

Title: Shareability of quantum correlations in a many-body spin system with two- and three-body interactions

Author: P. Kiran, Harsha Miriam Reji, Hemant S. Hegde, R. Prabhu

Issue&Volume: 2024/03/21

Abstract: The shareability of quantum correlations among the constituent parties of a multiparty quantum system is restricted by the quantum information theoretic concept called monogamy. Depending on the multiparty quantum systems, different measures of quantum correlations show disparate signatures for monogamy. We characterize the shareability of quantum correlations, from both entanglement-separability and information-theoretic kinds, in a multiparty quantum spin system containing two- and three-body interactions with respect to its system parameters and external applied magnetic field. Monogamy score in this system exhibits both monogamous and nonmonogamous traits depending on the quantum correlation measure, strengths of system parameters, and external magnetic field. The percentage of nonmonogamous states when the information-theoretic quantum correlations are considered is higher than that of the entanglement-separability kind in allowed ranges of these variables. The integral powers of the quantum correlation measures for which the nonmonogamous states become monogamous are identified.

DOI: 10.1103/PhysRevA.109.032423

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.032423