Entanglement and decoherence in spin gases
摘要
We study the dynamics of entanglement in spin gases. A spin gas consists of a (large) number of interacting particles whose random motion is described classically while their internal degrees of freedom are described quantum-mechanically. We determine the entanglement that occurs naturally in such systems for specific types of quantum interactions. At the same time, these systems provide microscopic models for non--Markovian decoherence: the interaction of a group of particles with other particles belonging to a background gas are treated exactly, and differences between collective and non--collective decoherence processes are studied. We give quantitative results for the Boltzmann gas and also for a lattice gas, which could be realized by neutral atoms hopping in an optical lattice. These models can be simulated efficiently for systems of mesoscopic sizes (N ~ 10^5).
引用
@article{arxiv.quant-ph/0502017,
title = {Entanglement and decoherence in spin gases},
author = {J. Calsamiglia and L. Hartmann and W. Dür and H. -J. Briegel},
journal= {arXiv preprint arXiv:quant-ph/0502017},
year = {2007}
}
备注
7 pages, 2 figures