Quantum channel identification problem

Quantum channel identification problem
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DOI:
10.1103/physreva.63.042304
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发表时间:
2001-04-01
期刊:
影响因子:
2.9
通讯作者:
Fujiwara, A
Fujiwara, A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fujiwara, A

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本文探讨了量子纠缠的一个应用。这里处理的问题是量子信道识别问题:给定一个量子信道的参数族{Gamma (theta)}(theta),找到估计参数theta真值的最佳策略。作为一个简单的例子,我们研究了类似或等于C-2的二能级量子系统H的各向同性退极化参数theta的估计问题。在非交换统计的框架下,证明了信道H × H上的最优输入状态根据参数theta的值表现出一种过渡行为。
This paper explores an application of quantum entanglement. The problem treated here is the quantum channel identification problem: given a parametric family {Gamma (theta)}(theta) of quantum channels, find the best strategy of estimating the true value of the parameter theta. As a simple example, we study the estimation problem of the isotropic depolarization parameter theta for a two-level quantum system H similar or equal to C-2. In the framework of noncommutative statistics, it is shown that the optimal input state on H x H to the channel exhibits a transitionlike behavior according to the value of the parameter theta.