Noise induced interference fringes in trapped ultracold bosonic gases

TL;DR

This paper investigates how external environmental noise can unexpectedly enhance quantum coherence in ultracold bosonic gases trapped in double-well potentials, revealing new insights into decoherence effects.

Contribution

It demonstrates that environmental noise can induce phase coherence in many-body ultracold atom systems, contrary to typical decoherence expectations.

Findings

Noise can restore phase coherence in ultracold gases

External environment may enhance quantum coherence

Coherence observed in averaged density profiles

Abstract

We study the dynamics of ultracold atoms trapped in optical double-well potentials in presence of noise generated by an external environment. When prepared in a Fock number state, the system shows phase coherence in the averaged density profile obtained using standard absorption image techniques, that disappears in absence of noise. This effect indicates that also in many-body systems an external environment may enhance quantum coherence, instead of destroying it.