面向纯态的 Fisher 对称信息完备测量
量子物理
2016-05-11 v2
摘要
我们引入一种新型量子测量,其对称性定义为在一组参数上具有均匀的 Fisher 信息,这些参数单射地表示某个基准纯态邻域内的纯量子态。该测量是局部信息完备的——即它能唯一确定这些参数,而非区分两个任意量子态——并且在多参数量子 Cramer-Rao 界意义下是极大的。对于一个 维量子系统,仅要求局部信息完备性,使得测量的输出结果数从通常的全局纯态信息完备性概念下接近但低于 的最小值,降低到 。
引用
@article{arxiv.1507.06904,
title = {Fisher-symmetric informationally complete measurements for pure states},
author = {Nan Li and Christopher Ferrie and Jonathan A. Gross and Amir Kalev and Carlton M. Caves},
journal= {arXiv preprint arXiv:1507.06904},
year = {2016}
}
备注
v2 has additional discussion of Fisher-symmetric measurements for mixed states and an additional example of a PFSIC that consists of coin flipping between two orthonormal bases. Two new authors. Additional minor changes throughout