论文标题
随机多部分量子状态的经典相关性共享性的限制
Restrictions on shareability of classical correlations for random multipartite quantum states
论文作者
论文摘要
与量子相关性不同,假定多部分状态的两个零件之间的经典相关性(CC)的共享性是免费的,因为存在为每个降低状态的CCS可以同时达到其代数最大值的状态。但是,当一个人从状态空间中随机挑出状态时,我们发现获得具有代数最大值的那些状态的概率很小。我们探讨了非平凡的上部构成的可能性,该局部统一产生随机多部分状态,并计算各种CC测量,常规经典相关器和两种经典相关性的公理测量的频率分布,即量子不段落的经典部分和工作缺陷的本地工作。我们发现这些分布通常是高斯样的,其标准偏差随各方数量的增加而降低。它还揭示了在多Qubit随机状态中,大多数降低的密度矩阵具有较低量的CC,也可以通过分布的平均值来确认,从而显示出对随机状态的经典相关性共享性的一种限制。此外,我们还注意到,随机状态的最大值远低于一组状态获得的代数最大值,并且两者之间的差距对于当事方数量较高的州而言进一步增加。我们报告说,对于更高数量的当事方,量子不一致的经典部分和本地工作可以遵循基于一夫一妻制的上限,而经典相关器具有不同的上限。随机状态中经典相关措施共享性的趋势显然在经典相关性的公理定义与传统相关性之间划分。
Unlike quantum correlations, the shareability of classical correlations (CCs) between two-parties of a multipartite state is assumed to be free since there exist states for which CCs for each of the reduced states can simultaneously reach their algebraic maximum value. However, when one randomly picks out states from the state space, we find that the probability of obtaining those states possessing the algebraic maximum value is vanishingly small. We explore the possibility of nontrivial upper bound by Haar uniformly generating random multipartite states and computing the frequency distribution for various CC measures, conventional classical correlators, and two axiomatic measures of classical correlations, namely the classical part of quantum discord and local work of work-deficit. We find that the distributions are typically Gaussian-like and their standard deviations decrease with the increase in number of parties. It also reveals that among the multiqubit random states, most of the reduced density matrices possess a low amount of CCs which can also be confirmed by the mean of the distributions, thereby showing a kind of restrictions on the sharability of classical correlations for random states. Furthermore, we also notice that the maximal value for random states is much lower than the algebraic maxima obtained for a set of states, and the gap between the two increases further for states with a higher number of parties. We report that for a higher number of parties, the classical part of quantum discord and local work can follow monogamy-based upper bound on sharability while classical correlators have a different upper bound. The trends of sharability for classical correlation measures in random states clearly demarcate between the axiomatic definition of classical correlations and the conventional ones.