Many-body interference at the onset of chaos

TL;DR

This paper investigates how many-body interference influences the dynamics of the Bose-Hubbard model, revealing that increased particle indistinguishability amplifies fluctuations, especially at the onset of quantum chaos, due to initial state coherences.

Contribution

It demonstrates the role of particle indistinguishability and exchange symmetries in many-body interference effects within the Bose-Hubbard model, highlighting the onset of chaos.

Findings

Enhanced temporal fluctuations with increased indistinguishability

Amplification of fluctuations at the onset of quantum chaos

Initial state coherences are key to interference signatures

Abstract

We unveil the signature of many-body interference across dynamical regimes of the Bose-Hubbard model. Increasing the particles' indistinguishability enhances the temporal fluctuations of few-body observables, with a dramatic amplification at the onset of quantum chaos. By resolving the exchange symmetries of partially distinguishable particles, we explain this amplification as the fingerprint of the initial state's coherences in the eigenbasis.