Quantum nonunital dynamics of spin-bath-assisted Fisher information

Quantum nonunital dynamics of spin-bath-assisted Fisher information

The nonunital non-Markovian dynamics of qubits immersed in a spin bath is studied without any Markovian approximation. The environmental effects on the precisions of quantum parameter estimation are taken into account. The time-dependent transfer matrix and inhomogeneity vector are obtained for the...

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Main Authors: Xiang Hao, Yinzhong Wu
Format: Article
Language:English
Published: AIP Publishing LLC 2016-04-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.4947035
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spelling doaj-5055cc5445c94e70a413cbaf79176ac52020-11-25T00:47:37ZengAIP Publishing LLCAIP Advances2158-32262016-04-0164045106045106-810.1063/1.4947035021604ADVQuantum nonunital dynamics of spin-bath-assisted Fisher informationXiang Hao0Yinzhong Wu1School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, People’s Republic of ChinaSchool of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, People’s Republic of ChinaThe nonunital non-Markovian dynamics of qubits immersed in a spin bath is studied without any Markovian approximation. The environmental effects on the precisions of quantum parameter estimation are taken into account. The time-dependent transfer matrix and inhomogeneity vector are obtained for the description of the open dynamical process. The dynamical behaviour of one qubit coupled to a spin bath is geometrically described by the Bloch vector. It is found out that the nonunital non-Markovian effects can engender the improvement of the precision of quantum parameter estimation. This result contributes to the environment-assisted quantum information theory.http://dx.doi.org/10.1063/1.4947035
collection DOAJ
language English
format Article
sources DOAJ
author Xiang Hao
Yinzhong Wu
spellingShingle Xiang Hao
Yinzhong Wu
Quantum nonunital dynamics of spin-bath-assisted Fisher information
AIP Advances
author_facet Xiang Hao
Yinzhong Wu
author_sort Xiang Hao
title Quantum nonunital dynamics of spin-bath-assisted Fisher information
title_short Quantum nonunital dynamics of spin-bath-assisted Fisher information
title_full Quantum nonunital dynamics of spin-bath-assisted Fisher information
title_fullStr Quantum nonunital dynamics of spin-bath-assisted Fisher information
title_full_unstemmed Quantum nonunital dynamics of spin-bath-assisted Fisher information
title_sort quantum nonunital dynamics of spin-bath-assisted fisher information
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2016-04-01
description The nonunital non-Markovian dynamics of qubits immersed in a spin bath is studied without any Markovian approximation. The environmental effects on the precisions of quantum parameter estimation are taken into account. The time-dependent transfer matrix and inhomogeneity vector are obtained for the description of the open dynamical process. The dynamical behaviour of one qubit coupled to a spin bath is geometrically described by the Bloch vector. It is found out that the nonunital non-Markovian effects can engender the improvement of the precision of quantum parameter estimation. This result contributes to the environment-assisted quantum information theory.
url http://dx.doi.org/10.1063/1.4947035
work_keys_str_mv AT xianghao quantumnonunitaldynamicsofspinbathassistedfisherinformation
AT yinzhongwu quantumnonunitaldynamicsofspinbathassistedfisherinformation
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