Dissipation induced coherence of a two-mode Bose-Einstein condensate

TL;DR

This paper investigates how dissipation, phase noise, and particle loss can induce and enhance coherence in a two-mode Bose-Einstein condensate, revealing stochastic resonance effects and dissipation-assisted purification.

Contribution

It demonstrates that dissipation can induce coherence and restore condensate purity, especially when combined with strong interactions, revealing novel dissipation-driven phenomena in BECs.

Findings

Maximal phase coherence occurs at a finite dissipation rate.

Dissipation combined with strong interactions restores condensate purity.

Dissipation induces stochastic resonance effects in the system.

Abstract

We discuss the dynamics of a Bose-Einstein condensate in a double-well trap subject to phase noise and particle loss. The phase coherence of a weakly-interacting condensate as well as the response to an external driving show a pronounced stochastic resonance effect: Both quantities become maximal for a finite value of the dissipation rate matching the intrinsic time scales of the system. Even stronger effects are observed when dissipation acts in concurrence with strong inter-particle interactions, restoring the purity of the condensate almost completely and increasing the phase coherence significantly.