PROPERTIES OF A QUANTUM SYSTEM DURING THE TIME INTERVAL BETWEEN 2 MEASUREMENTS
PROPERTIES OF A QUANTUM SYSTEM DURING THE TIME INTERVAL BETWEEN 2 MEASUREMENTS
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DOI：
10.1103/physreva.41.11
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发表时间：
1990-01-01
影响因子：
2.9
通讯作者：
VAIDMAN, L
中科院分区：
文献类型：
--
作者：
AHARONOV, Y;VAIDMAN, L
给出了两次连续测量之间的时间间隔上的量子系统的描述。两个波函数，第一个由初始测量预先选择，第二个由最终测量后选择，描述量子系统在一个单一的时间。它示出了这种方法如何导致一个新的概念：一个弱值的观察。弱值代表了量子系统在两次测量之间的新特性。它们是标准测量程序的结果，满足了“弱点”的某些要求。我们称之为弱测量。探讨了弱测量的物理意义、基本数学结构和实际应用前景。
A description of quantum systems at the time interval between two successive measurements is presented. Two wave functions, the first preselected by the initial measurement and the second postselected by the final measurement, describe quantum systems at a single time. It is shown how this approach leads to a new concept: a weak value of an observable. Weak values represent novel characteristics of quantum systems between two measurements. They are outcomes of a standard measurement procedure that fulfills certain requirements of ‘‘weakness.’’We call it weak measurement. Physical meaning, underlying mathematical structure, and prospects of practical usage of weak measurements are explored.