Investigating the origin of time with trapped ions

@inproceedings{Massar2014InvestigatingTO,
  title={Investigating the origin of time with trapped ions},
  author={Serge Massar and Philippe Spindel and Andr'es F. Var'on and Christof Wunderlich},
  year={2014}
}
Even though quantum systems in energy eigenstates do not evolve in time, they can exhibit correlations between internal degrees of freedom in such a way that one of the internal degrees of freedom behaves like a clock variable, and thereby defines an internal time, that parametrises the evolution of the other degrees of freedom. This situation is of great interest in quantum cosmology where the invariance under reparametrisation of time implies that the temporal coordinate dissapears and is… 
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