Abstract
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.
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