微结构光纤中利用四波混频产生光子对：理论与实验
Photon pair generation using four-wave mixing in a microstructured fibre: theory versus experiment
摘要：
我们发展了一个理论分析的四波混频用于产生光子对有用的量子信息处理。该分析适用于正常色散区的超短相干脉冲泵浦的单模微结构光纤。给定光纤内的光传播常数，我们可以估计每个脉冲产生的光子对的数量，它们的中心波长和各自的带宽。我们使用的实验结果从皮秒源的相关光子对使用微结构光纤来验证模型。光纤在708nm处的正常色散区被泵浦，并且对于586nm和894nm的宽间隔参量波长满足相位匹配。我们测量的光子数，每个脉冲使用一个损失无关的符合计划，并比较结果与理论预期。对于不同的光纤长度和泵浦功率，我们的理论预期与实验结果吻合得很好。
英文摘要：
We develop a theoretical analysis of four-wave mixing used to generate photon pairs useful for quantum information processing. The analysis applies to a single mode microstructured fibre pumped by an ultra-short coherent pulse in the normal dispersion region. Given the values of the optical propagation constant inside the fibre, we can estimate the created number of photon pairs per pulse, their central wavelength and their respective bandwidth. We use the experimental results from a picosecond source of correlated photon pairs using a micro-structured fibre to validate the model. The fibre is pumped in the normal dispersion regime at 708nm and phase matching is satisfied for widely spaced parametric wavelengths of 586nm and 894nm. We measure the number of photons per pulse using a loss-independent coincidence scheme and compare the results with the theoretical expectation. We show a good agreement between the theoretical expectations and the experimental results for various fibre lengths and pump powers.
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