Quantum tomography via unambiguous state discrimination

被引：13
|
作者：
Salazar, R. [1 ]
Delgado, A.
机构：
[1] Univ Concepcion, Ctr Opt & Photon, Concepcion, Chile
来源：
PHYSICAL REVIEW A | 2012年 / 86卷 / 01期
关键词：
OPTIMAL DISTINCTION; DIFFERENTIATE;
D O I：
10.1103/PhysRevA.86.012118
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study the determination of an unknown mixed state of a d-dimensional quantum system by means of unambiguous state discrimination. We show that optimal and nonoptimal unambiguous state discrimination can be used to reconstruct unknown states of a qubit. This result is extended to the case of a qudit by a sequence of reconstructions in two-dimensional subspaces. The total number of projections scales approximately as 2d(2) for d large; this is twice as much as in the case of tomography based on mutually unbiased bases or symmetric informationally complete positive-operator-valued measures, and less than the d(3) projections required by standard tomography.
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页数：6
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