 |
Center for Nonlinear Studies |
Quantum Darwinism has arisen as a framework to understand how the classical, objective world emerges from this fundamentally unpredictable quantum substrate. Here we show that a sufficient condition for the proliferation of objective information into the world is that a system undergoes pure decoherence. The crux of our demonstration is to show explicitly that many observers can independently extract information about the certain states of the system – the so-called pointer states. The information is thus redundant, and, for a system in two possible configurations, the redundancy is quantified by the Quantum Chernoff Information. The information is also robust – it is accessible even in very noisy environments and to the least savvy observers. These results clarify the role of amplification in the quantum-to-classical transition, as well as elucidate the environment's ability to act as a communication channel and create objective states of quantum systems.
Host: Adolfo del Campo, T-4 and CNLS