Fisher informations and local asymptotic normality for continuous-time quantum Markov processes
Fisher informations and local asymptotic normality for continuous-time quantum Markov processes
复制标题
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
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
M. Guţă
中科院分区:
文献类型:
--
作者:
C. Cătană;L. Bouten;M. Guţă
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.
DOI:
10.1088/1751-8113/47/41/415302
发表时间:
2014
期刊:
Mathematical and Theoretical
影响因子:
--
作者:
Catana C
通讯作者:
Catana C
DOI:
10.48550/arxiv.1206.4956
发表时间:
2012
期刊:
--
影响因子:
--
作者:
Girotti F
通讯作者:
Girotti F
DOI:
10.48550/arxiv.1403.0116
发表时间:
2014
期刊:
--
影响因子:
--
作者:
Catana C
通讯作者:
Catana C