Quantum Darwinism in Quantum Brownian Motion

Quantum Darwinism-the redundant encoding of information about a decohering system in its environment-was proposed to reconcile the quantum nature of our Universe with apparent classicality. We report the first study of the dynamics of quantum Darwinism in a realistic model of decoherence, quantum Brownian motion. Prepared in a highly squeezed state-a macroscopic superposition-the system leaves records whose redundancy increases rapidly with initial delocalization. Redundancy appears rapidly (on the decoherence time scale) and persists for a long time.