Entanglement and decoherence in spin gases

TL;DR

This paper investigates entanglement dynamics and decoherence mechanisms in spin gases, providing exact models for non-Markovian decoherence and quantitative analysis for different gas types, with implications for quantum simulations.

Contribution

It introduces microscopic models for entanglement and decoherence in spin gases, including exact treatments of non-Markovian effects and efficient simulation methods for large systems.

Findings

Quantitative results for entanglement in Boltzmann and lattice gases.

Exact modeling of non-Markovian decoherence processes.

Efficient simulation approaches for mesoscopic systems.

Abstract

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).