Initial System-Environment Correlations via the Transfer Tensor Method

TL;DR

This paper introduces a transfer tensor method to efficiently simulate open quantum systems with initial correlations, enabling access to complex regimes and spectral analysis that were previously difficult to achieve.

Contribution

The authors develop a transfer tensor approach that leverages short-time evolution data to simulate correlated open quantum systems more effectively than existing methods.

Findings

Accurately reproduces exact solutions for benchmark systems.

Enables calculation of emission spectra in multichromophoric systems.

Detects spectral signatures of electromagnetically-induced transparency.

Abstract

Open quantum systems exhibiting initial system-environment correlations are notoriously difficult to simulate. We point out that given a sufficiently long sample of the exact short-time evolution of the open system dynamics, one may employ transfer tensors for the further propagation of the reduced open system state. This approach is numerically advantageous and allows for the simulation of quantum correlation functions in hardly accessible regimes. We benchmark this approach against analytically exact solutions and exemplify it with the calculation of emission spectra of multichromophoric systems as well as for the reverse temperature estimation from simulated spectroscopic data. Finally, we employ our approach for the detection of spectral signatures of electromagnetically-induced transparency in open three-level systems.