Revivals in the attractive BEC in a double-well potential and their decoherence

TL;DR

This paper investigates the dynamics of attractive Bose-Einstein condensates in a double-well potential, revealing revival phenomena in population imbalance and analyzing the effects of decoherence due to particle losses.

Contribution

It provides a detailed explanation of revival dynamics in attractive BECs and incorporates dissipative effects using master equations and stochastic wave methods.

Findings

Population imbalance exhibits damped oscillations and revivals.

Revival behavior is sensitive to decoherence from particle losses.

Multiple models successfully explain the observed dynamics.

Abstract

We study the dynamics of ultracold attractive atoms in a weakly linked two potential wells. We consider an unbalanced initial state and monitor dynamics of the population difference between the two wells. The average imbalance between wells undergoes damped oscillations, like in a classical counterpart, but then it revives almost to the initial value. We explain in details the whole behavior using three different models of the system. Furthermore we investigate the sensitivity of the revivals on the decoherence caused by one- and three-body losses. We include the dissipative processes using appropriate master equations and solve them using the stochastic wave approximation method.