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In this article, using the numerically exact time-evolving matrix productoperators method, we study the fidelity out-of-time-order correlator (FOTOC) inthe unbiased spin-boson model at zero temperature. It is found that after theinitial exponential growth of FOTOC, the information of the system dynamicswill adulterate into the FOTOC. This makes the FOTOC an advanced epitome of thesystem dynamics, i.e., the FOTOC shows similar behavior to that of systemdynamics within a shorter time interval. Eventually the progress of the FOTOCis ahead of the system dynamics, which can provide a prediction of the systemdynamics.

Fidelity Out-of-Time-Order Correlator in the Spin-Boson Model