Thermofield-based chain mapping approach for open quantum systems

Ines de Vega, Mari-Carmen Bañuls

Published 2015-04-27Version 1

We consider a thermofield approach to analyze the evolution of an open quantum system coupled to an environment at finite temperature. In this approach, the finite temperature environment is exactly mapped onto two virtual environments at zero temperature. These two environments are then unitarily transformed into two different chains of oscillators, leading to a one dimensional structure that can be numerically studied using tensor network techniques.