Quantum nonunital dynamics of spin-bath-assisted Fisher information | Zendy

Xiang Hao | Zendy; YinZhong Wu | Zendy

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Quantum nonunital dynamics of spin-bath-assisted Fisher information

Author(s) -

Xiang Hao,

YinZhong Wu

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4947035

Subject(s) - qubit , physics , statistical physics , spin (aerodynamics) , markov process , quantum , fisher information , quantum mechanics , open quantum system , quantum information , mathematics , statistics , thermodynamics

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

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