Measurement of relative phase diffusion between two Bose-Einstein condensates

TL;DR

This paper presents a method to measure the phase diffusion between two Bose-Einstein condensates using their quantum coherence properties and radiation absorption, enabling insights into decoherence processes.

Contribution

It introduces a novel measurement technique for relative phase diffusion in BECs that leverages their macroscopic coherence and intermediate level occupation.

Findings

Decoherence rate can be inferred from intermediate level occupation.

Phase collapse is measurable via radiation absorption.

Method applicable to different hyperfine states.

Abstract

We propose a method of measuring diffusion of the relative phase between two Bose-Einstein condensates occupying different nuclear or spin hyperfine states coupled by a two-photon transition via an intermediate level. Due to the macroscopic quantum coherence the condensates can be decoupled from the electromagnetic fields. The rate of decoherence and the phase collapse may be determined from the occupation of the intermediate level or the absorption of radiation.