Quantum erasure with causally disconnected choice

Ma, Xiao-Song, Kofler, Johannes, Qarry, Angie, Tetik, Nuray, Scheidl, Thomas, Ursin, Rupert, Ramelow, Sven, Herbst, Thomas, Ratschbacher, Lothar, Fedrizzi, Alessandro, Jennewein, Thomas and Zeilinger, Anton (2013) Quantum erasure with causally disconnected choice. Proceedings of the National Academy of Sciences of the United States of America, 110 4: 1221-1226. doi:10.1073/pnas.1213201110

Author 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
Title Quantum erasure with causally disconnected choice
Journal name Proceedings of the National Academy of Sciences of the United States of America   Check publisher's open access policy
ISSN 0027-8424
Publication date 2013-01-22
Sub-type Article (original research)
DOI 10.1073/pnas.1213201110
Volume 110
Issue 4
Start page 1221
End page 1226
Total pages 6
Place of publication Washington, DC, United States
Publisher National Academy of Sciences
Collection year 2014
Language eng
Abstract 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.
Keyword Quantum foundations
Quantum optics
Quantum information processing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Centre for Quantum Computer Technology Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 16 times in Scopus Article | Citations
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