Information processing with Page-Wootters states
arXiv:1411.7293 · doi:10.1142/9789814602136_0007
Abstract
In order to perceive that a physical system evolves in time, two requirements must be met: (a) it must be possible to define a "clock" and (b) it must be possible to make a copy of the state of the system, that can be reliably retrieved to make a comparison. We investigate what constraints quantum mechanics poses on these issues, in light of recent experiments with entangled photons.
9 pages LaTeX2e, 1 eps figure. Contribution to the special volume "Chaos, Information Processing and Paradoxical Games", World Scientific (2014)