最近，在[F]中提供了一种新的操作策略来访问Tr[A ρ B]形式的量子关联函数。Buscemi，M. Dall'Arno，M. Ozawa，and V. Vedral，arXiv：1312.4240].在这里，我们提出了一个实现方案，我们称之为部分期望值，实现这种战略的一个单一的相互作用与辅助系统的测量上的附属观察。我们的计划是普遍的，独立于ρ，A和B，它是最佳的统计意义。该方案适合于现有量子光学技术的实现，为检验不确定关系提供了一种新的途径。
英文摘要：
Recently, a novel operational strategy to access quantum correlation functions of the form Tr[A rho B] was provided in [F. Buscemi, M. Dall'Arno, M. Ozawa, and V. Vedral, arXiv:1312.4240]. Here we propose a realization scheme, that we call partial expectation values, implementing such strategy in terms of a unitary interaction with an ancillary system followed by the measurement of an observable on the ancilla. Our scheme is universal, being independent of rho, A, and B, and it is optimal in a statistical sense. Our scheme is suitable for implementation with present quantum optical technology, and provides a new way to test uncertainty relations.
Error and Disturbance as Irreversibility with Applications: Unified Definition, Wigner--Araki--Yanase Theorem and Out-of-Time-Order Correlator
Graduate School of Information Science and Technology, Hokkaido University（北海道大学信息理工学院）；RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN（理化学研究所交叉理论数学科学中心（iTHEMS））；Department of Informatics, Faculty of Information Science and Electrical Engineering, Kyushu University（九州大学信息电气工程学院信息系）；JST, FOREST（日本科学技术振兴机构，FOREST计划）
