Physics – Quantum Physics
Scientific paper
2008-12-05
Physics
Quantum Physics
Scientific paper
The pure quantum correlations totally independent of the classical coherence of light have been experimentally demonstrated. By measuring the visibility of the interference fringes and the correlation variances of amplitude and phase quadratures between a pair of bright twin optical beams with different frequencies produced from a non-degenerate optical parametric oscillator, we found that when classical interference became worse even vanished, the quadrature quantum correlations were not influenced, completely. The presented experiment obviously shows the quantum correlations of light do not necessarily imply the classical coherence.
Jia* Xiaojun
Peng Kunchi
Shang Yana
Su Xiaolong
Xie Changde
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