Adiabatic preparation of Floquet condensates

TL;DR

This paper proposes a method to adiabatically transform a Bose-Einstein condensate into a Floquet condensate, demonstrating minimal entropy generation in a driven bosonic Josephson junction, thus enabling controlled creation of time-dependent many-particle states.

Contribution

It introduces a theoretical framework for adiabatically preparing Floquet condensates in many-body systems, showing minimal entropy production with carefully tuned driving parameters.

Findings

Effective adiabatic transport is possible despite dense quasienergy spectra.

Minimal Floquet entropy is generated during the smooth turn-on of the driving force.

The method is demonstrated using a driven bosonic Josephson junction model.

Abstract

We argue that a Bose-Einstein condensate can be transformed into a Floquet condensate, that is, into a periodically time-dependent many-particle state possessing the coherence properties of a mesoscopically occupied single-particle Floquet state. Our reasoning is based on the observation that the denseness of the many-body system's quasienergy spectrum does not necessarily obstruct effectively adiabatic transport. Employing the idealized model of a driven bosonic Josephson junction, we demonstrate that only a small amount of Floquet entropy is generated when a driving force with judiciously chosen frequency and maximum amplitude is turned on smoothly.