A quantum delayed choice experiment

Peruzzo, A, Shadbolt, P, Brunner, N, Popescu, S and O'Brien, J 2012, 'A quantum delayed choice experiment', Science, vol. 338, no. 6107, pp. 634-637.

Document type: Journal Article
Collection: Journal Articles

Title A quantum delayed choice experiment
Author(s) Peruzzo, A
Shadbolt, P
Brunner, N
Popescu, S
O'Brien, J
Year 2012
Journal name Science
Volume number 338
Issue number 6107
Start page 634
End page 637
Total pages 4
Publisher American Association for the Advancement of Science
Abstract Quantum systems exhibit particle-like or wave-like behaviour depending on the experimental apparatus they are confronted by. This wave-particle duality is at the heart of quantum mechanics, and is fully captured in Wheeler's famous delayed choice gedanken experiment. In this variant of the double slit experiment, the observer chooses to test either the particle or wave nature of a photon after it has passed through the slits. Here we report on a quantum delayed choice experiment, based on a quantum controlled beam-splitter, in which both particle and wave behaviours can be investigated simultaneously. The genuinely quantum nature of the photon's behaviour is tested via a Bell inequality, which here replaces the delayed choice of the observer. We observe strong Bell inequality violations, thus showing that no model in which the photon knows in advance what type of experiment it will be confronted by, hence behaving either as a particle or as wave, can account for the experimental data.
Subject Mathematical Physics not elsewhere classified
DOI - identifier 10.1126/science.1226719
ISSN 0036-8075
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Citation counts: TR Web of Science Citation Count  Cited 116 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 88 times in Scopus Article | Citations
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