Coherent control of phase diffusion in a Bosonic Josephson junction by scattering length modulation

TL;DR

This paper presents a method to control phase diffusion in a Bosonic Josephson junction through scattering length modulation, enhancing coherence and potentially improving atom interferometry with BECs.

Contribution

It introduces a temporal-periodic modulation scheme to prevent quantum collapse due to phase and number diffusion in BEC Josephson junctions.

Findings

Control scheme effectively suppresses phase diffusion

Enhances coherence time in BEC interferometry

Feasible with magnetic Feshbach resonances

Abstract

By means of a temporal-periodic modulation of the s-wave scattering length, a procedure to control the evolution of an initial atomic coherent state associated with a Bosonic Josephson junction is presented. The scheme developed has a remarkable advantage of avoiding the quantum collapse of the state due to phase and number diffusion. This kind of control could prove useful for atom interferometry using BECs, where the interactions limit the evolution time stage within the interferometer, and where the modulation can be induced via magnetic Feshbach resonances as recently experimentally demonstrated.