利用弱测量直接测量一般量子态
量子物理
2012-03-14 v1
摘要
近期工作[J.S. Lundeen等, Nature, 474, 188 (2011)]通过先弱测量一个变量、再对互补变量进行正常（即“强”）测量，直接测量了波函数。我们将此方法推广到混合态，通过考虑这些可观测量各种乘积的弱测量，从而为密度矩阵提供了基于其直接测量程序的操作性定义。该方法仅需在两个基下进行测量，且可“原位”执行，在不破坏量子态的情况下确定量子态。
引用
@article{arxiv.1112.5471,
title = {Direct measurement of general quantum states using weak measurement},
author = {Jeff S. Lundeen and Charles Bamber},
journal= {arXiv preprint arXiv:1112.5471},
year = {2012}
}
备注
This is a later and very different version of arXiv:1110.0727v3 [quant-ph]. New content: a method to directly measure each element of the density matrix, specific Hamiltonians to weakly measure the product of non-commuting observables, and references to recent related work