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arXiv quant-ph/0607137quant-ph
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偏振纠缠态的色散扩展与双光子干涉

Dispersion spreading of polarization-entangled states of light and two-photon interference

G. Brida, M. V. Chekhova, M. Genovese, L. A. Krivitsky

摘要:

研究了偏振纠缠双光子光场在共线频率简并自发参量下转换过程中二阶强度关联函数的干涉结构。由于双光子光通过具有群速度色散(GVD)的光纤传播时双光子振幅的扩展,该结构是可视化的。由于色散的存在,在非线性晶体的输出端不需要任何双折射补偿就可以获得偏振纠缠的Bell态;相反,需要适当地选择强度关联函数的时间。在非线性晶体的输出处插入双折射材料(减小相反偏振的双光子之间的初始o-e延迟或增加该延迟)导致关联函数的更复杂的干涉结构。

英文摘要:

We study the interference structure of the second-order intensity correlation function for polarization-entangled two-photon light obtained from type-II collinear frequency-degenerate spontaneous parametric down-conversion (SPDC). The structure is visualised due to the spreading of the two-photon amplitude as two-photon light propagates through optical fibre with group-velocity dispersion (GVD). Because of the spreading, polarization-entangled Bell states can be obtained without any birefringence compensation at the output of the nonlinear crystal; instead, proper time selection of the intensity correlation function is required. A birefringent material inserted at the output of the nonlinear crystal (either reducing the initial o-e delay between the oppositely polarized twin photons or increasing this delay) leads to a more complicated interference structure of the correlation function.

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