Imaginary Potential Induced Quantum Coherence for Bose-Einstein Condensates

TL;DR

This paper demonstrates that even weak imaginary potentials can induce perfect quantum coherence between initially independent Bose-Einstein condensates, revealing new ways to control coherence in quantum gases.

Contribution

It introduces the concept that complex potentials, specifically imaginary potentials, can induce quantum coherence in Bose-Einstein condensates, a novel approach in quantum control.

Findings

Weak imaginary potentials induce perfect coherence between condensates

Quantum coherence can be controlled via complex potentials

The scheme for observing this effect is discussed

Abstract

The role of complex potentials in single-body Schr\H{o}dinger equation has been studied intensively. We study the quantum coherence for degenerate Bose gases in complex potentials, when the exchange symmetry of identical bosons is considered. For initially independent Bose-Einstein condensates, it is shown that even very weak imaginary potential can induce perfect quantum coherence between different condensates. The scheme to observe imaginary potential induced quantum coherence is discussed.