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Quantum erasure with causally disconnected choice.(PHYSICS)(Report)(Author abstract)

Ma, Xiao - Song ; Kofler, Johannes ; Qarry, Angie ; Tetik, Nuray ; Scheidl, Thomas ; Ursin, Rupert ; Ramelow, Sven ; Herbst, Thomas ; Ratschbacher, Lothar ; Fedrizzi, Alessandro ; Jennewein, Thomas ; Zeilinger, Anton

Proceedings of the National Academy of Sciences of the United States, Jan 22, 2013, Vol.110(4), p.1221(6) [Periódico revisado por pares]

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  • Título:
    Quantum erasure with causally disconnected choice.(PHYSICS)(Report)(Author abstract)
  • Autor: Ma, Xiao - Song ; Kofler, Johannes ; Qarry, Angie ; Tetik, Nuray ; Scheidl, Thomas ; Ursin, Rupert ; Ramelow, Sven ; Herbst, Thomas ; Ratschbacher, Lothar ; Fedrizzi, Alessandro ; Jennewein, Thomas ; Zeilinger, Anton
  • Assuntos: Quantum Mechanics -- Research ; Particle Physics -- Research
  • É parte de: Proceedings of the National Academy of Sciences of the United States, Jan 22, 2013, Vol.110(4), p.1221(6)
  • Descrição: The counterintuitive features of quantum physics challenge many common-sense assumptions. In an interferometric quantum eraser experiment, one can actively choose whether or not to erase which-path information (a particle feature) of one quantum system and thus observe its wave feature via interference or not by performing a suitable measurement on a distant quantum system entangled with it. In all experiments performed to date, this choice took place either in the past or, in some delayed-choice arrangements, in the future of the interference. Thus, in principle, physical communications between choice and interference were not excluded. Here, we report a quantum eraser experiment in which, by enforcing Einstein locality, no such communication is possible. This is achieved by independent active choices, which are space-like separated from the interference. Our setup employs hybrid path-polarization entangled photon pairs, which are distributed over an optical fiber link of 55 m in one experiment, or over a free-space link of 144 km in another. No naive realistic picture is compatible with our results because whether a quantum could be seen as showing particle- or wave-like behavior would depend on a causally disconnected choice. It is therefore suggestive to abandon such pictures altogether. quantum foundations | quantum optics | quantum information processing doi/10.1073/pnas.1213201110
  • Idioma: English

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