Disorder effects on the quantum coherence of a many-boson system

TL;DR

This paper investigates how disorder influences quantum coherence in many-boson systems within a double well model, revealing disorder-induced enhancement, robustness of coherence revivals, and a beat phenomenon in coherence dynamics.

Contribution

It provides new insights into the effects of disorder on quantum coherence and dynamical behavior in many-boson systems, especially in the deep Mott regime.

Findings

Disorder enhances quantum coherence in the ground state.

Quantum coherence exhibits robust periodic collapses and revivals despite disorder.

A beat phenomenon appears in coherence-decoherence oscillations over time.

Abstract

The effects of disorders on the quantum coherence for many-bosons are studied in a double well model. For the ground state, the disorder enhances the quantum coherence. In the deep Mott regime, dynamical evolution reveals periodical collapses and revivals of the quantum coherence which is robust against the disorder. The average over variations in both the on-site energy and the interaction reveals a beat phenomenon of the coherence-decoherence oscillation in the temporal evolution.