https://doi.org/10.1140/epjb/e2008-00421-5
Dephasing in two decoupled one-dimensional Bose-Einstein condensates and the subexponential decay of the interwell coherence
1
Atominstitut der Österreichischen
Universitäten, TU Wien, 1020 Vienna, Austria
2
A.F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
Corresponding author: a igor.mazets@gmail.com
Received:
17
July
2008
Revised:
3
September
2008
Published online:
22
November
2008
We provide a simple physical picture of the loss of coherence between two coherently split one-dimensional Bose-Einstein condensates. The source of the dephasing is identified with nonlinear corrections to the elementary excitation energies in either of the two independent condensates. We retrieve the result by Burkov, Lukin and Demler [Phys. Rev. Lett. 98, 200404 (2007)] on the subexponential decay of the coherence ∝exp [-(t/t0)2/3] for the large time t, however, the scaling of t0 differs.
PACS: 03.75.Gg – Entanglement and decoherence in Bose-Einstein condensates / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008