Weak Measurement-Assisted Coherence Enhancement with Initial System-Environment Correlation
We study the coherence dynamics of a two-level atom interacting with a zero temperature reservoir beyond the initial factorization assumption. An exact analytic solution for the reduced dynamics of a two-level system in this model has been obtained. It is shown that the initial correlations can improve the coherence in both Markovian and non-Markovian regimes. Moreover, the performance of weak measurement and quantum measurement reversal can further enhance the coherence. Remarkably, the system’s coherence approach to a steady value in the long time limit. This phenomenon of “coherence trapping” originates from the fact that the quantum measurement reversal functions as a coherent driving and retrieves the coherence.
KeywordsQuantum coherence Weak measurement Initial system-environment correlation
XX is supported by the Funds of the National NSFC under Grant No. 11805040 and No. 11665004 and the Natural Science Foundation of Jiangxi under Grant No. 20171BAB201019. YL Li is supported by the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology.