脉冲宽度对量子定位测量精度的影响

基于光量子和全球定位系统的理论,设计了HOM相干和量子空间定位的实验方案。讨论了在脉冲激光作用下,第II类参量下转换所产生的纠缠双光子的光谱特征、对应的HOM相干函数特点以及对量子定位的影响。结果表明,随着脉冲宽度的增加,纠缠双光子的光谱函数的不对称性增强、量子相干性减弱,量子定位的测量精度降低。

The Impact of Pump Band-width on the Measuring Accuracy of Quantum Spatial Positioning

Based on the theory of optical photon and global spatial positioning,the experimental scheme of the HOM coherence and quantum spatial positioning is designed.The spectrum characters of the entanglement photons with spontaneous type-II parametric down-conversion pumped by a broadband frequency pulse laser are discussed.The characteristic of HOM coherent function and the impact of the phase matching conditions on the quantum spatial positioning are analyzed.It is shown that as increasing the pump band-width,the asymmetry of the phase-matching function is increased,the coherence of entangled biphoton is diminished,and the measuring accuracy of the quantum spatial positioning is reduced as well.