Two-mode dipolar bosonic junctions

TL;DR

This paper investigates the ground-state properties of a two-mode dipolar bosonic Josephson junction using an extended Bose-Hubbard model, focusing on quantum correlations, coherence, and the formation of Schrödinger-cat states.

Contribution

It introduces a detailed analysis of dipolar bosonic junctions with an extended Bose-Hubbard model, highlighting quantum correlations and state transitions.

Findings

Identification of quantum correlations via Fisher information and entanglement entropy.

Observation of coherence loss associated with Schrödinger-cat state emergence.

Dependence of ground-state properties on inter-well interactions.

Abstract

We consider a two-mode atomic Josephson junction realized with dilute dipolar bosons confined by a double-well. We employ the two-site extended Bose-Hubbard Hamiltonian and characterize the ground-state of this system by the Fisher information, coherence visibility, and entanglement entropy. These quantities are studied as functions of the interaction between bosons in different wells. The emergence of Schroedinger-cat like state with a loss of coherence is also commented.