Violation of the Cauchy-Schwarz inequality in the macroscopic regime

We have observed a violation of the Cauchy-Schwarz inequality in the macroscopic regime by more than 8 standard deviations. The violation has been obtained while filtering out only the low-frequency noise of the quantum-correlated beams that results from the technical noise of the laser used to gene...

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Bibliographic Details
Published in:Physical review letters 2008-06, Vol.100 (23), p.233601-233601, Article 233601
Main Authors: Marino, A M, Boyer, V, Lett, P D
Format: Article
Language:English
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Summary:We have observed a violation of the Cauchy-Schwarz inequality in the macroscopic regime by more than 8 standard deviations. The violation has been obtained while filtering out only the low-frequency noise of the quantum-correlated beams that results from the technical noise of the laser used to generate them. We use bright intensity-difference squeezed beams produced by four-wave mixing as the source of the correlated fields. We also demonstrate that squeezing does not necessarily imply a violation of the Cauchy-Schwarz inequality.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.100.233601