Quantum metrology with a non-Markovian qubit system

Quantum metrology with a non-Markovian qubit

system

Jiang Huang;Wen-Qing Shi;Yu-Ping Xie;Guo-Bao Xu;Hui-Xian Wu

【期刊名称】《中国物理：英文版》

【年(卷),期】2018(027)012

【摘要】The dynamics of the quantum Fisher information (QFI) of phase parameter estimation in a non-Markovian dissipative qubit system is investigated within the structure of single and double Lorentzian spectra. We use the time-convolutionless method with fourth-order perturbation expansion to obtain the general forms of QFI for the qubit system in terms of a non-Markovian master equation. We find that the phase parameter estimation can be enhanced in our model within both single and double Lorentzian spectra. What is more, the detuning and spectral width are two significant factors affecting the enhancement of parameter-estimation precision.

【总页数】6页(196-201)

【关键词】

【作者】Jiang Huang;Wen-Qing Shi;Yu-Ping Xie;Guo-Bao Xu;Hui-Xian Wu

【作者单位】College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China;College of Electronics and Information Engineering, Guangdong Ocean University,