An intuitive and natural way to quantify memory effects through measures on a probe quantum system is given from the aspect of sensitivity of environmental state. After several measures on the probe system, the degree of memory effects is given by the maximum distinguishability of output states of probe system corresponding to the variation of past evolution time. Quantum Fisher information on the past evolution duration which reflects the sensitivity of environmental state with respect to the system–environment evolution duration becomes the characteristic parameter of memory degree. The estimation process is applied on both classical and quantum environments, and the memory degree from the aspect of sensitivity of environmental state reflects the memory speed of environment.

从环境状态敏感性的角度出发，给出了一种通过对探针量子系统进行测量来量化记忆效应的直观自然方法。在对探针系统进行几次测量后，记忆效应的程度由对应于过去进化时间变化的探针系统输出状态的最大可分辨性给出。关于过去演化持续时间的Quantum Fisher信息反映了环境状态相对于系统的敏感性-环境演化持续时间成为记忆度的特征参数。估计过程既适用于经典环境，也适用于量子环境，从环境状态敏感性的角度来看，存储程度反映了环境的存储速度。