基于三级非等长非线性干涉仪研制了1550 nm通信波段便携式偏振纠缠光子对量子光源,其中,三级非等长非线性干涉仪由3根长度呈二项分布(1∶2∶1)的色散位移光纤和单模光纤构成.偏振纠缠量子光源产生的纠缠光子对收集效率大于85%,在符合计数率为4 kHz的条件下,双光子干涉可见度可达(77.1±0.6)%,在损耗仅为光纤传输损耗的情况下,成功利用单模光纤远距离分发纠缠光子对超100 km.
Portable Polarization-Entangled Quantum Photon Source Base on Un-Even Three-Stage Nonlinear Interferometer
Based on the un-even three-stage nonlinear interferometer instrument,this article has developed 1550 nm communication band portable polarization-entangled quantum photon source,in which three nonlinear fibers with lengths following binomial distribution(1∶2∶1)are sandwiched with two standard single mode fibers.The collection efficiency of entangled photons generated by polarized entangled quantum photon sources is greater than 85%.Under the condition of a counting rate of 4 kHz,the two-photon interference visibility of the entangled source is(77.1±0.6)%.In the case where the loss is only fiber transmission loss,the single-mode fiber is successfully used to distribute entangled photon pairs over 100 km over long distances.
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