报道了利用周期极化铌酸锂晶体外腔谐振增强倍频技术获得波长分别为1560 nm 和780 nm 双色量子关联光场。由于该量子关联系统的激光波长分别位于量子态传输波段与原子存储波段，可应用于研究实用化量子信息处理系统。在利用谐振倍频获得10 mW 倍频光输出、倍频效率达45%的基础上，实测1560 nm 基频光与780 nm 倍频光的量子关联为1.2 dB。

Two-color quantum correlation between fundamental (1.56 mm) and second-harmonic (780 nm) fields is investigated by an external cavity- enhanced periodically poled lithium niobate frequency doubler. Centers wavelength of the system at 1560 nm and 780 nm are in the wave band of quantum states transmission and quantum storage, respectively. So this kind of system can be employed for researches of practical quantum information processing. When the second-harmonic power of 10 mW is obtained with the conversion efficiency of 45%, 1.2 dB quantum correlation between fundamental (1560 nm) and second-harmonic (780 nm) fields is observed.