Adiabatic transport of Bose-Einstein condensate in double-well trap

TL;DR

This paper explores a novel adiabatic transport method for Bose-Einstein condensates in double-well traps using time-dependent Gaussian coupling, demonstrating its effectiveness across various interactions and comparing it with traditional Landau-Zener protocols.

Contribution

It introduces a new adiabatic transport protocol employing pulsed Gaussian coupling, expanding the control over BEC transport in double-well systems.

Findings

Successful transport across a wide range of interactions.

Nonlinear effects can be harnessed to improve transport.

Gaussian coupling offers a new regime with switchable transport.

Abstract

A complete irreversible adiabatic transport of Bose-Einstein condensate (BEC) in a double-well trap is investigated within the mean field approximation. The transfer is driven by time-dependent (Gaussian) coupling between the wells and their relative detuning. The protocol successfully works in a wide range of both repulsive and attractive BEC interaction. The nonlinear effects caused by the interaction can be turned from detrimental into favorable for the transport. The results are compared with familiar Landau-Zener scenarios using the constant coupling. It is shown that the pulsed Gaussian coupling provides a new transport regime where coupling edges are decisive and convenient switch of the transport is possible.