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A Coarse-grained Schrödinger Cat
Johannes Kofler, Časlav Brukner
63 - 68
NATO Science for Peace and Security Series - D: Information and Communication Security
Volume 11: Quantum Communication and Security
Abstract

We show that under coarse-grained measurements there is no observational difference between a quantum superposition of macroscopically distinct states (“Scrödinger-cat states”) and a classical mixture of these states. Since normally our observations in every-day life are of limited accuracy, no quantum features can be observed. Remarkably, the information gain in such classical coarse-grained measurements is only half of the maximal information gain in sharp quantum measurements. This suggests a novel approach to macroscopic realism and classical physics within quantum theory.

$35.00 / €27.50 / £22.00
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