Extremal covariant positive operator valued measures

被引：20
|
作者：
Chiribella, G
D'Ariano, GM
机构：
[1] Dipartimento Fis A Volta, Unita Pavia, Ist Nazl Fis Mat, QUIT Grp, I-27100 Pavia, Italy
[2] Northwestern Univ, Dept Elect & Comp Engn, Evanston, IL 60208 USA
来源：
JOURNAL OF MATHEMATICAL PHYSICS | 2004年 / 45卷 / 12期
关键词：
D O I：
10.1063/1.1806262
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider the convex set of positive operator valued measures (POVM) which are covariant under a finite dimensional unitary projective representation of a group. We derive a general characterization for the extremal points, and provide bounds for the ranks of the corresponding POVM densities, also relating extremality to uniqueness and stability of optimized measurements. Examples of applications are given. (C) 2004 American Institute of Physics.
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页码：4435 / 4447
页数：13
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