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Time from quantum entanglement: An experimental illustration (Articolo in rivista)

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Time from quantum entanglement: An experimental illustration (Articolo in rivista) (literal)

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Moreva E.[ 1,2 ]; Brida G.[ 1 ]; Gramegna M.[ 1 ]; Giovannetti V.[ 3,4 ]; Maccone L.[ 5 ] ; Genovese M.[ 1 ] (2014)
Time from quantum entanglement: An experimental illustration
in Physical review. A, Atomic, molecular, and optical physics (Online)
(literal)

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Moreva E.[ 1,2 ]; Brida G.[ 1 ]; Gramegna M.[ 1 ]; Giovannetti V.[ 3,4 ]; Maccone L.[ 5 ] ; Genovese M.[ 1 ] (literal)

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[ 1 ] INRIM, I-10135 Turin, Italy [ 2 ] Moscow MV Lomonosov State Univ, Ctr Int Laser, Moscow 119991, Russia [ 1 ] INRIM, I-10135 Turin, Italy[ 3 ] Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy [ 4 ] CNR, Ist Nanosci, I-56126 Pisa, Italy [ 5 ] Univ Pavia, Dipartimento Fis A Volta, Sez Pavia, Ist Nazl Fis Nucl, I-27100 Pavia, Italy (literal)

Titolo

Abstract

In previous years several theoretical papers discussed if time can be an emergent property deriving from quantum correlations. Here, to provide insight into how this phenomenon can occur, we present an experiment that illustrates Page and Wootters' mechanism of \"static\" time [D. N. Page and W. K. Wootters, Phys. Rev. D 27, 2885 (1983)0556-282110.1103/PhysRevD.27.2885], and Gambini et al. for subsequent refinements [R. Gambini, Phys. Rev. D 79, 041501(R) (2009)PRVDAQ1550-799810.1103/PhysRevD.79.041501]. 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. © 2014 American Physical Society. (literal)

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