Quantum Darwinism

TL;DR

Quantum Darwinism explains how the environment's proliferation of information about a quantum system leads to classical robustness and offers insights into the quantum measurement problem.

Contribution

It introduces a framework that accounts for the emergence of classicality, wave-packet collapse, and derives Born's rule from environmental proliferation.

Findings

Environment records multiple states of a quantum system

Proliferation explains classical robustness of quantum states

Framework advances understanding of the quantum measurement problem

Abstract

Quantum Darwinism describes the proliferation, in the environment, of multiple records of selected states of a quantum system. It explains how the fragility of a state of a single quantum system can lead to the classical robustness of states of their correlated multitude; shows how effective `wave-packet collapse' arises as a result of proliferation throughout the environment of imprints of the states of quantum system; and provides a framework for the derivation of Born's rule, which relates probability of detecting states to their amplitude. Taken together, these three advances mark considerable progress towards settling the quantum measurement problem.