Enhancement of parameter-estimation precision in noisy systems by dynamical decoupling pulses
Enhancement of parameter-estimation precision in noisy systems by dynamical decoupling pulses
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DOI：
10.1103/physreva.87.032102
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发表时间：
2013-03
影响因子：
2.9
通讯作者：
Q. Tan;Yixiao Huang;Xiao Yin;L. Kuang;Xiaoguang Wang
中科院分区：
文献类型：
--
作者：
Q. Tan;Yixiao Huang;Xiao Yin;L. Kuang;Xiaoguang Wang
提出了一种利用动态解耦脉冲提高噪声系统参数估计精度的方法。利用传递矩阵和时变克劳斯算子，得到了未知参数估计精度的精确解析表达式。我们证明了通过控制动态解耦脉冲可以使噪声系统的PPE保持在海森堡极限内。研究发现，较大的脉冲数和较长的储层相关时间可以有效地保护PPE。
We present a scheme to enhance the precision of parameter estimation (PPE) in noisy systems by employing dynamical decoupling pulses. An exact analytical expression for the estimation precision of an unknown parameter is obtained by using the transfer matrix and time-dependent Kraus operators. We show that the PPE in noisy systems can be preserved in the Heisenberg limit by control of the dynamical decoupling pulses. It is found that a larger number of pulses and longer reservoir correlation time can greatly protect the PPE.