Quantum Fisher Information of Entangled States in Spin-Boson System

Abstract

Abstract: We investigate the effects of the Ohmic-like bosonic environment on the precision of quantum parameter estimation in the typical spin-boson model. When atoms are driven by external fields, the dynamics of quantm Fisher information of N independent atoms by means of time-dependent quantum master equation and superoperators. According to the numerical results, it is found out that the values of quantum Fisher information can be enhanced with the increase of the number of entangled atom. However, the quantum Fisher information also decays quickly when N is large. During the characteristic period, the quantum metrology based on maximally entangled state is superior to that based on product state. When the spectral parameter s is large, the decay of the quantum Fisher information can be suppressed to a certain extent in the super-Ohmic bosonic environment.

Key words: spin-boson model, quantum entanglement, quantum parameter estimation, quantum Fisher information

CLC Number:

0431

References

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