Entanglement and Irreversibility in the Approach to Thermal Equilibrium

TL;DR

This paper explores how entanglement and information dilution in quantum systems lead to thermalization and apparent irreversibility, providing new analytical tools for understanding zero-temperature quantum channels.

Contribution

It introduces new analytical results for zero-temperature quantum channels, including a measure of entanglement and an analysis of irreversibility related to classical information loss.

Findings

New quantitative measure of entanglement at zero temperature

Analysis of irreversibility when classical labels are lost

Insights into the quantum basis of thermalization and irreversibility

Abstract

When a physical system is put in contact with a very large thermal bath, it undergoes a dissipative (i.e., an apparently irreversible) process that leads to thermal equilibrium. This dynamical process can be described fully within quantum physics, involving only unitary, therefore reversible, maps. The information, initially present in the system, is not erased, but is diluted in the bath because of entanglement. Irreversibility may arise if, after quantum information has been thus diluted, some classical information is lost. This paper reviews a model for thermalization that displays these features. Two new analytical results are provided for the zero-temperature channels: a new quantitative measure of entanglement, and a study of irreversibility in the case where the lost classical information is the label of the particles in the bath.