Abstract
We report the experimental violation of Cauchy-Schwarz (CS) inequality by the nonclassical intensity twin beam. It’s particularly of interest to demonstrate the nonclassical behaviours of the electromagnetic field. The most well-known examples of nonclassical effects are photon antibunching[1], sub-poissonian photon statistics[2], squeezing[3] and nonclassical correlation between light beams indicated by violation of CS inequality [4]. The violation of the CS inequality has been observed by Clauser[4] in the radiation emitted in an atomic two-photon cascade with coincidence counting technique, and expected theoretically in a two-photon laser[5], parametric amplifier[6], resonance fluorescence[7] and other systems[8,9]. Intense intensity twin beam with nonclassical correlation has been also obtained in OPO experiments[10]. In this letter, we give a new method to establish nonclassical correlation between macrosopic light beams and demonstrate violation of CS inequality.
© 1992 IQEC
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