Quantum multiparameter metrology with generalized entangled coherent state
Quantum multiparameter metrology with generalized entangled coherent state
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广义纠缠相干态量子多参数计量
DOI：
10.1088/1751-8113/49/11/115302
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发表时间：
2016-03-18
影响因子：
2.1
通讯作者：
Wang, Xiaoguang
中科院分区：
文献类型：
--
作者：
Liu, Jing;Lu, Xiao-Ming;Wang, Xiaoguang
提出了一种广义形式的纠缠相干态，并将其应用于多臂光学干涉仪中来估计多个相移。我们得到了线性和非线性参数化协议的量子Cramer-Rao界。通过利用联合估计进行分析。我们发现，ECS的这种推广形式比推广的中午状态(2013 Phys.莱特牧师。111 070403)。此外，与独立估计相比，线性和非线性协议在参数个数方面具有相同的优势。
We propose a generalized form of entangled coherent states (ECS) and apply them in a multi-arm optical interferometer to estimate multiple phase shifts. We obtain the quantum Cramer-Rao bounds for both the linear and nonlinear parametrization protocols. Through analysis utilizing simultaneous estimation. we find that this generalized form of ECS gives better precision than the generalized NOON states (2013 Phys. Rev. Lett. 111 070403). Moreover, when compared with the independent estimation both the linear and nonlinear protocols have the same advantage in the relation to the number of parameters.