| 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 |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Proc. Natl. Acad. Sci. USA 110, 1221-1226 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1073/pnas.1213201110 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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