Dynamical Change of Quantum Fisher Information of Cavity-Reservoir Systems

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Communications in Theoretical Physics ›› 2016, Vol. 65 ›› Issue (04) : 453-459.

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Dynamical Change of Quantum Fisher Information of Cavity-Reservoir Systems

Jiang Huang, Qin Xie

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Abstract

We study the quantum Fisher information (QFI) dynamics of the phase parameter in the enlarged cavity-reservoir systems at zero temperature under two situations of large N limit and non-Markovian environment, respectively. We find an important relation that the total quantities of QFI of the cavity and reservoir are equal to unit during the dynamical evolution. The lost QFI of the cavity transfers to its corresponding reservoir with the same quantities simultaneously. Moreover, we also find that the detuning parameter and non-Markovian effect are two significant factors to affect the preservation of QFI.

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dynamical change / quantum Fisher information / cavity-reservoir systems

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Jiang Huang, Qin Xie. Dynamical Change of Quantum Fisher Information of Cavity-Reservoir Systems[J]. Communications in Theoretical Physics, 2016, 65(04): 453-459

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Funding

Supported by the National Natural Science Foundation of China under Grant No. 11374096 and the Natural Science Foundation of Guangdong Province under Grant No. 2015A030310354 and the Projection of Enhancing School with Innovation of Guangdong Ocean University under Grant Nos. GDOU2014050251 and GDOU2014050252