利用非平衡光纤Mach-Zehnder干涉仪探测频率非简并纠缠态光场  

Measurement of entangled state of light with non-degenerate frequency utilizing non-balanced fiber Mach-Zehnder interferometer

作　　者：商娅娜[1] 王东[1] 闫智辉[1] 王文哲[1] 贾晓军[1] 彭堃墀[1] 

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006

出　　处：《物理学报》2008年第6期3514-3518,共5页Acta Physica Sinica

基　　金：教育部“长江学者和创新团队发展计划”(批准号:IRT0516);国家自然科学基金(批准号:60608012,60736040,10674088);国家重点基础研究发展计划(973)项目(批准号:2006CB921101)资助的课题~~

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.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.

关 键 词：光学参量振荡腔 孪生光束 光纤Mach-Zehnder干涉仪 

分 类 号：O431.2[机械工程—光学工程]