Engineered thermalization and cooling of quantum many-body systems

منو

" Engineered thermalization and cooling of quantum many-body systems "
Metcalf, MekenaMoussa, Jonathan Ede Jong, Wibe ASarovar, Mohan

Document Type	:	AL
Record Number	:	901825
Doc. No	:	LA68z7c151
Title & Author	:	Engineered thermalization and cooling of quantum many-body systems [Article]\ Metcalf, MekenaMoussa, Jonathan Ede Jong, Wibe ASarovar, Mohan
Date	:	2020
Title of Periodical	:	Lawrence Berkeley National Laboratory
Abstract	:	We develop a scheme for engineering genuine thermal states in analog quantum simulation platforms by coupling local degrees of freedom to driven, dissipative ancilla pseudospins. We demonstrate the scheme in a many-body quantum spin lattice simulation setting. A Born-Markov master equation describing the dynamics of the many-body system is developed, and we show that if the ancilla energies are periodically modulated, with a carefully chosen hierarchy of timescales, one can effectively thermalize the many-body system. Through analysis of the time-dependent dynamical generator, we determine the conditions under which the true thermal state is an approximate dynamical fixed point for general system Hamiltonians. Finally, we evaluate the thermalization protocol through numerical simulation and discuss prospects for implementation on current quantum simulation hardware.