Coherent control of atomic spin currents in a double well

TL;DR

This paper presents a feasible method to control atomic spin currents in a double-well Bose-Einstein condensate using external fields, enabling manipulation of spin and tunneling phenomena for quantum technologies.

Contribution

It introduces a novel approach for controlling spin and particle currents in a two-component BEC via external fields, with potential applications in quantum information and metrology.

Findings

Spin currents and tunneling directions can be controlled by adiabatically varying the coupling.

The system allows for studying spin and tunneling phenomena across various interaction parameters.

Spin-squeezed states can be generated for quantum applications.

Abstract

We propose an experimental feasible method for controlling the atomic currents of a two-component Bose-Einstein condensate in a double well by applying an external field to the atoms in one of the potential wells. We study the ground-state properties of the system and show that the directions of spin currents and net-particle tunneling can be manipulated by adiabatically varying the coupling strength between the atoms and the field. This system can be used for studying spin and tunneling phenomena across a wide range of interaction parameters. In addition, spin-squeezed states can be generated. It is useful for quantum information processing and quantum metrology.