Fisher informations and local asymptotic normality for continuous-time quantum Markov processes

Fisher informations and local asymptotic normality for continuous-time quantum Markov processes
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连续时间量子马尔可夫过程的 Fisher 信息和局部渐近正态性

DOI:
10.1088/1751-8113/48/36/365301
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发表时间:
2014
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
M. Guţă
M. Guţă
中科院分区:
--
文献类型:
--
作者:
C. Cătană;L. Bouten;M. Guţă

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在输入输出形式下,我们考虑了一个开放量子系统的任意动力学参数的估计问题。对于不可约马尔可夫过程,我们证明了在大时间极限下,系统输出态可以用其平均值与未知参数成正比的量子高斯态来近似。该近似在参数空间中尺寸为t−的邻域内局部成立,并给出了渐近量子Fisher信息的马尔可夫生成元的显式表示.此外,我们还证明了计数和零差测量的加性统计量也满足局部渐近正态分布,并计算了相应的经典Fisher信息。以二能级系统和原子脉泽为例说明了一般理论。我们的结果有助于更好地理解输出过程的统计和概率性质,这与量子控制工程和非平衡量子开放系统的理论有关。
We consider the problem of estimating an arbitrary dynamical parameter of an open quantum system in the input–output formalism. For irreducible Markov processes, we show that in the limit of large times the system-output state can be approximated by a quantum Gaussian state whose mean is proportional to the unknown parameter. This approximation holds locally in a neighbourhood of size t − 1 / 2 ?> in the parameter space, and provides an explicit expression of the asymptotic quantum Fisher information in terms of the Markov generator. Furthermore we show that additive statistics of the counting and homodyne measurements also satisfy local asymptotic normality and we compute the corresponding classical Fisher informations. The general theory is illustrated with the examples of a two-level system and the atom maser. Our results contribute towards a better understanding of the statistical and probabilistic properties of the output process, with relevance for quantum control engineering, and the theory of non-equilibrium quantum open systems.
原子微波激射器中的最大似然与无似然量子系统识别
DOI: 10.1088/1751-8113/47/41/415302
发表时间: 2014
期刊: Mathematical and Theoretical
影响因子: --
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DOI: 10.48550/arxiv.1206.4956
发表时间: 2012
期刊: --
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作者:
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