All-fiber source of frequency-entangled photon pairs
All-fiber source of frequency-entangled photon pairs
复制标题
DOI：
10.1103/physreva.79.033817
复制
发表时间：
2009-03-01
影响因子：
2.9
通讯作者：
Yu, Daoyin
中科院分区：
文献类型：
--
作者：
Li, Xiaoying;Yang, Lei;Yu, Daoyin
我们提出了一种在Sagnac光纤环中使用四波混频的全光纤频率纠缠光子对源。特别注意通过冷却光纤和匹配光纤环中反向传播的光子对的偏振模式来抑制频率纠缠的杂质。对光纤环中不同空间模式的成对产生的信号光子和闲置光子的符合检测表明，量子干涉以空间拍频的形式存在，而单个信号(闲置)光子的单个计数保持不变。当光纤环各传播方向的光子对产生率约为0.065对/脉冲时，量子干涉包络的可见度为(95+/-2)%，接近理论计算的98.7%。
We present an all-fiber source of frequency-entangled photon pairs by using four-wave mixing in a Sagnac fiber loop. Special care is taken to suppress the impurity of the frequency entanglement by cooling the fiber and by matching the polarization modes of the photon pairs counterpropagating in the fiber loop. Coincidence detection of signal and idler photons, which are created in pair and in different spatial modes of the fiber loop, shows the quantum interference in the form of spatial beating, while the single counts of the individual signal (idler) photons keep constant. When the production rate of photon pairs in each propagation direction of the fiber loop is about 0.065 pairs/pulse, the envelope of the quantum interference reveals a visibility of (95 +/- 2)%, which is close to the calculated theoretical limit 98.7%.