Time from quantum entanglement: an experimental illustration

@article{Moreva2014TimeFQ,
  title={Time from quantum entanglement: an experimental illustration},
  author={Ekaterina Moreva and Giorgio Brida and Marco Gramegna and Vittorio Giovannetti and Lorenzo Maccone and Marco Genovese},
  journal={Physical Review A},
  year={2014},
  volume={89},
  pages={052122}
}
In the last years several theoretical papers discussed if time can be an emergent property deriving from quantum correlations. Here, to provide an insight into how this phenomenon can occur, we present an experiment that illustrates Page and Wootters' mechanism of "static" time, and Gambini et al. subsequent refinements. A static, entangled state between a clock system and the rest of the universe is perceived as evolving by internal observers that test the correlations between the two… 

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