Ⅰ类倍频中的双色连续变量纠缠特性分析

Two-color Continuous Variable Entanglement in Type Ⅰ SHG

不同波长光场的连续变量纠缠在精密测量、量子通信网络等方面具有重要的潜在应用.倍频过程已经被证明是产生光场压缩态与纠缠态的有效器件.本文分析了单共振与双共振I类倍频过程中的量子纠缠特性,结果表明:两个不同波长的输出光场具有量子纠缠特性,最后给出了纠缠特性随各种实验参数的变化关系,为其在量子测量与量子网络中的应用提供了参考.

Continuous-variable entanglement between different color optical fields has potential application in precesion measurement and quantum communication network. Second-harmonic generation （SHG） has been proved to be efficient device in optical frequency conversion and continuous-variable entanglement generation. In this paper, we analyze quantum entanglement in singly resonant and doubly resonant type I SHG. It is shown that two-color entanglement can be generated. The dependence of entanglement on various parameters is given.