Measuring time-dependent induced quantum coherences via two-dimensional coherence spectroscopy

We propose a two-dimensional spectroscopic protocol for measuring the time-dependent coherences between stationary states of system induced by system-bath interaction. also investigate role temporally correlated noise on coherence dephasing. This enables dynamical information about and its coupling to environment be determined. Our results are based quantum-trajectory method, obtained from both approximate, analytical exact, numerical solutions Schr\"odinger equation. As an example, we show how this can used exciton dynamics in conjugated polymers their torsional modes with environment.