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Shortcut to Equilibration of an Open Quantum System

Research paper by Roie Dann, Ander Tobalina, Ronnie Kosloff

Indexed on: 20 Dec '18Published on: 20 Dec '18Published in: arXiv - Quantum Physics



Abstract

We present a procedure to accelerate the relaxation rate of an open quantum system towards its equilibrium state. The control protocol, termed Shorcut to Equilibration, is obtained by reverse engineering the non-adiabatic master equations. This is a non-unitary control task aimed at rapidly changing the entropy of the system. Such a protocol serves as a shortcut to an abrupt change in the Hamiltonian (quench) followed by exponential decay. As an example, we study the thermalization of a particle in an harmonic well, demonstrating that for short times there is four orders of magnitude improvement in accuracy.