Quantum simulation of expanding space–time with tunnel-coupled condensates

Language
en
Document Type
Article
Issue Date
2016-04-21
Issue Year
2015
Authors
Neuenhahn, Clemens
Marquardt, Florian
Editor
Abstract

We consider two weakly interacting quasi-1D condensates of cold bosonic atoms. It turns out that a time-dependent variation of the tunnel-coupling between those condensates is equivalent to the spatial expansion of a one-dimensional toy-Universe, with regard to the dynamics of the relative phase field. The dynamics of this field is governed by the quantum sine-Gordon equation. Thus, this analogy could be used to 'quantum simulate' the dynamics of a scalar, interacting quantum field on an expanding background. We discuss how to observe the 'freezing' of quantum fluctuations during an accelerating expansion in a possible experiment. We also analyze an experimental protocol to study the formation of sine-Gordon breathers in the relative phase field, seeded by quantum.

Journal Title
New Journal of Physics
Volume
17
Issue
12
Citation
New Journal of Physics 17.12 (2015) <http://iopscience.iop.org/article/10.1088/1367-2630/17/12/125007/pdf>
Zugehörige ORCIDs