Interconversion of dark soliton and Josephson vortex in a quasi-1D long Bose Josephson junction

TL;DR

This paper explores the interconversion between dark solitons and Josephson vortices in a quasi-1D Bose Josephson junction, analyzing transition rates, quantum effects, and potential applications in quantum information transfer.

Contribution

It introduces a method to control and analyze the interconversion between DS and JV, including quantum phase-slip effects and qubit potential in BEC systems.

Findings

Interconversion rates between DS and JV are quantified.

Quantum phase-slip can create superpositions of JVs with opposite vorticities.

Potential for using JVs in coherent atomic BEC transfer is proposed.

Abstract

Dark soliton (DS) and Josephson vortex (JV) in quasi-1D long Bose Josephson junction (BJJ) can be interconverted by tuning Josephson coupling. Rates of the interconversion as well as of the thermally activated phase-slip effect, resulting in the JV switching its vorticity, have been evaluated. The role of quantum phase-slip in creating superposition of JVs with opposite vorticities as a qubit is discussed as well. Utilization of the JV for controlled and coherent transfer of atomic Bose-Einstein condensate (BEC) is suggested.