Violation of the Cauchy-Schwarz Inequality in the Macroscopic Regime

Details Violation of the Cauchy-Schwarz Inequality in the Macroscopic Regime Violation of the Cauchy-Schwarz Inequality in the Macroscopic Regime

2008-02-21

arxiv.org/abs/0802.3183v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.233601

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.

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