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
影响因子:
2.9
通讯作者:
Fujiwara, A
中科院分区:
文献类型:
--
作者:
Fujiwara, A
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.