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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2016-04-01
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Online Access: | http://dx.doi.org/10.1063/1.4947035 |
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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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1725259557017485312 |