Beyond mean-field dynamics in open Bose-Hubbard chains

TL;DR

This paper explores how phase noise and particle loss influence the dynamics of Bose-Einstein condensates in optical lattices, revealing dissipation-induced coherence preservation and potential for engineering stable quantum structures.

Contribution

It introduces methods to extend mean-field approximations for dissipative Bose-Hubbard systems and demonstrates how localized dissipation can enhance coherence and stabilize quantum states.

Findings

Localized particle dissipation can suppress decay.

Dissipation can restore coherence in BECs.

Potential to engineer stable quantum structures.

Abstract

We investigate the effects of phase noise and particle loss on the dynamics of a Bose-Einstein condensate in an optical lattice. Starting from the many-body master equation, we discuss the applicability of generalized mean-field approximations in the presence of dissipation as well as methods to simulate quantum effects beyond mean-field by including higher-order correlation functions. It is shown that localized particle dissipation leads to surprising dynamics, as it can suppress decay and restore the coherence of a Bose-Einstein condensate. These effects can be applied to engineer coherent structures such as stable discrete breathers and dark solitons.