1. classical simulation of quantum devices

Archak Purkayastha

Trinity College, Ireland

27 July 2021 Tue 5 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

Quantum devices generically consist of an interacting quantum many-body system connected to multiple baths at different temperatures and chemical potentials. Obtaining the dynamics of such a system either numerically or analytically is a challenging problem. This is due to a combination of the prevalence of strong correlations in the system, the infinite nature of the baths and the long time to reach steady state. In recent work, we have developed a general formalism that allows access to the full non-Markovian dynamics of such open quantum many-body systems up to the non-equilibrium steady state (NESS). Specifically, we show how finite-time evolution in presence of finite-sized baths, whose opportune size is determined by their original spectral density, can be recursively used to faithfully reconstruct the exact dynamics without requiring any small parameter. Such a reconstruction is possible even in parameter regimes which would otherwise be inaccessible by other state-of-the-art techniques.

Ref:arXiv:2012.10236 (to be published in Phys Rev B.)