Smith Brian J, Mahou P, Cohen Offir, Lundeen J S, Walmsley I A
Centre for Quantum Technologies, National University of Singapore 3 Science Drive 2, 117543 Singapore, Singapore.
Opt Express. 2009 Dec 21;17(26):23589-602. doi: 10.1364/OE.17.023589.
We study both experimentally and theoretically the generation of photon pairs by spontaneous four-wave mixing (SFWM) in standard birefringent optical fibers. The ability to produce a range of two-photon spectral states, from highly correlated (entangled) to completely factorable, by means of cross-polarized birefringent phase matching, is explored. A simple model is developed to predict the spectral state of the photon pair which shows how this can be adjusted by choosing the appropriate pump bandwidth, fiber length and birefringence. Spontaneous Raman scattering is modeled to determine the tradeoff between SFWM and background Raman noise, and the predicted results are shown to agree with experimental data.
我们通过实验和理论研究了标准双折射光纤中自发四波混频（SFWM）产生光子对的现象。借助交叉极化双折射相位匹配，探索了产生一系列双光子光谱态的能力，这些光谱态从高度相关（纠缠）到完全可分解。我们开发了一个简单模型来预测光子对的光谱态，该模型展示了如何通过选择合适的泵浦带宽、光纤长度和双折射来进行调整。对自发拉曼散射进行建模以确定SFWM与背景拉曼噪声之间的权衡，并且预测结果与实验数据相符。
