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Thursday, December 13, 2012
12:30 PM - 2:00 PM
T-DO Conference Room Bldg 123, Room 121

Quantum Lunch

Universality of redundancy under pure decoherence

Michael Zwolak
Department of Physics Oregon State University

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