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中文摘要：
采用两对光纤构成的非平衡Mach-Zehnder干涉仪,对非简并光学参量振荡腔产生的20mW频率非简并孪生光束间的强度差与位相和的关联噪声进行测量,在分析频率为2MHz处测得关联噪声分别低于散粒噪声基准3·1和1·3dB,从实验上证实了在较低分析频率处孪生光束之间有较高量子纠缠.
英文摘要：
The dependence of the quantum correlation of twin beams generated from a non-degenerate optical parametric oscillator on the analysis frequency was theoretically studied with semi-classical method. It was pointed out that the quantum entanglement is higher at lower analysis frequency. By means of a pair of unbalanced fiber Mach-Zehnder interferometers,the correlation noise spectrum of the intensity-difference and the phase-sum of twin beams with non-degenerate frequencies and total power of 20mW were experimentally measured,which were 3.1 and 1.3dB below the corresponding shot noise limit at 2MHz,respectively. The experimental results are in agreement with the theoretical predictions.
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