Problems in the field of open quantum systems often involve an environment that strongly influences the dynamics of excited states. Here we present a numerical method to model optical spectra of non-Markovian open quantum systems. The method employs a process tensor framework to efficiently compute multi-time correlations in a numerically exact way. To demonstrate the efficacy of our method, we compare 2D electronic spectroscopy simulations produced through our method to Markovian master equation simulations in three different system-bath coupling regimes.
@article{arxiv.2402.15454,
title = {Process tensor approaches to modeling two-dimensional spectroscopy},
author = {Roosmarijn de Wit and Jonathan Keeling and Brendon W. Lovett and Alex W. Chin},
journal= {arXiv preprint arXiv:2402.15454},
year = {2025}
}
Comments
A previous version of this manuscript was withdrawn due to an error in interpretation. The weak coupling master equation to which we compared neglected the Lamb shift, which has been now been incorporated in the latest version. The agreement between exact results and weak coupling master equations is now better than reported in the previous version