Recently it has been shown that gravity is an emergent phenomenon of
quantum mechanics; however, no experiment has been conceived to
verify. Now comes time along with an experiment.
http://arxiv.org/abs/1310.4691
Time from quantum entanglement: an experimental illustration
Ekaterina Moreva, Giorgio Brida, Marco Gramegna, Vittorio Giovannetti,
Lorenzo Maccone, Marco Genovese
(Submitted on 17 Oct 2013)
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 subsystems. We implement this mechanism using an entangled
state of the polarization of two photons, one of which is used as a
clock to gauge the evolution of the second: an internal observer
that becomes correlated with the clock photon sees the other system
evolve, while an external observer that only observes global
properties of the two photons can prove it is static.
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