Środowiskowe Seminarium z Informacji i Technologii Kwantowych

In quantum computing and simulation, one of our main goals is to efficiently mimic natural physical phenomena in a controlled manner. The process of thermalization is one such crucial task, for which recently there has been relevant progress. In this talk, we will showcase important parts of this progress by introducing a recent dissipative evolution that models thermalization in the many-body setting, and that is efficiently implementable in a quantum computer. We then prove the following facts about this dissipative evolution:
1) It faithfully reproduces the dissipation induced by weak coupling to a bath.2) In the high temperature regime, it very quickly approaches equilibrium.3) In the low temperature regime, it can reproduce arbitrary quantum computations.

Taken together, our results show that quantum dissipative evolutions have the potential to mirror the success of classical Monte Carlo methods.