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中文摘要：
利用激光脉冲抽运40m的色散平坦光子晶体光纤（PCF），通过四波混频（FWM）效应获得了高质量、高计数率的纠缠光子源。实验测得信号与闲频光分别处于1545nm和1555nm处。光子对的符合与偶然符合比可达8，对应的符合速率达1．43kHz。理论结果与实验结果基本吻合，该系统可作为量子密钥分发系统的光源，误码率可小于6％。
英文摘要：
We demonstrate a high quality and high counting rate source of entangled photon pairs through four-wavemixing （FWM） by pumping a 40m dispersion-flattened photonic crystal fiber （PCF）. This pair of photons, which are called signal/idle wave, is found at 1545 nm and 1555 nm, respectively. The coincidence and accidental coincidence ratio （C/A） can reach to 8, with the coincidence rate of 1.43 kHz. The computer results have tallied in general with the experiment. Such a system can be used as the source of quantum key distribution system with a bit error rate less than 6 %.
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