Chain-map** techniques combined with the time-dependent density matrix
renormalization group are powerful tools for simulating the dynamics of open quantum …

We consider a well-known, exactly solvable model of an open quantum system with pure
decoherence. The aim of this paper is twofold. Firstly, decoherence is a property of open …

We propose a time-dependent perturbation theory to study a newly discovered
pseudocoherent phase of the spin-boson model. Effectiveness of the method is confirmed by …

Quantum state preparation (QSP) is an essential step in many quantum information
processing tasks and has been deeply studied in a closed system. However, environmental …

In this thesis we develop methods for many-body open quantum systems and apply them to
systems of organic polaritons. The methods employ a mean-field approach to reduce the …

This thesis focuses on the numerically exact computation of the nonequilibrium quantum
dynamics of several instances of the Caldeira-Leggett model. It begins with a detailed …