Interaction-induced coherence among polar bosons stored in triple-well potentials

TL;DR

This paper investigates how intersite interactions induce nonlocal coherence among polar bosons in triple-well potentials, revealing a robustness that could impact quantum coherence control.

Contribution

It introduces the concept of nonlocal interaction-induced coherence in triple-well systems and analyzes its origin and stability against perturbations.

Findings

Nonlocal coherence is predominantly between outer sites when total filling is odd.

Interaction-induced coherence originates from superposition of degenerate many-body states.

The coherence remains robust against tunneling perturbations and thermal fluctuations.

Abstract

We study first-order spatial coherence for interacting polar bosons trapped in triple-well potentials. It is argued that besides the well-known coherence produced by couplings related to tunneling between the sites, there exists a nonlocal coherence predominantly determined by intersite interactions, which prevails between the outer sites of the triple well when their total filling is odd. We find that the nonlocal interaction-induced coherence originates from the superposition of degenerate many-body states in symmetric triple wells, and demonstrate its robustness against perturbations due to various tunneling mechanisms and thermal fluctuations.