Gaussian trajectory description of fragmentation in an isolated spinor condensate
Abstract
Spin-1 Bose gases quenched to spin degeneracy exhibit fragmentation: the appearance of a condensate in more than one single-particle state. Due to its highly entangled nature, the dynamics leading to this collective state are beyond the scope of a Gaussian variational approximation of the many-body wave function. Here, we improve the performance of the Gaussian variational Ansatz by considering dissipation into a fictitious environment, effectively suppressing entanglement within individual quantum trajectories at the expense of introducing a classical mixture of states. We find that this quantum trajectory approach captures the dynamical formation of a fragmented condensate, and analyze how much dissipation should be added to the experiment in order to keep a single realization in a non-fragmented state.
Cite
@article{arxiv.2107.10889,
title = {Gaussian trajectory description of fragmentation in an isolated spinor condensate},
author = {Lennart Fernandes and Michiel Wouters and Jacques Tempere},
journal= {arXiv preprint arXiv:2107.10889},
year = {2022}
}
Comments
Revised and accepted version; 14 pages including appendices, 9 figures