基于和频与差频级联的全光单光子波长变换(英文)  

All-optical Single-photon Wavelength Conversion Based on Cascaded Sum-frequency Generation and Difference-frequency Generation

作　　者：李万杰[1] 朱畅华[1] 赵楠[1] 裴昌幸[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071

出　　处：《光子学报》2013年第7期763-767,共5页Acta Photonica Sinica

基　　金：The National Natural Science Foundation of China(No.61072067);the 111 Project(No.B08038);ISN(No.1001004);the Fundamental Research Funds for the Central Universities(Nos.K50510010004,K5051201021)

摘　　要：基于周期极化铌酸锂波导,提出了一种采用和频产生与差频产生级联的全光单光子波长变换方案.在海森堡绘景下,通过非线性变换过程的哈密顿量求解了目标单光子信号的湮灭算子,进而根据变换前后的光子数算符之比得到了单光子波长变换的效率.分析了和频产生过程以及差频产生过程中单光子的转换效率与泵浦功率之间的关系,证明了存在最佳泵浦功率使得量子态能够完全转移.数值分析结果表明,当上变换(和频产生)泵浦光功率为65mW、下变换(差频产生)泵浦光功率为150mW时,由1 550nm到1 530nm的单光子波长变换可达到61%的转换效率.给出了级联单光子波长变换的实验装置,包括周期极化铌酸锂波导、泵浦激光、准单光子信号源、滤波等光学元器件、单光子探测器和同步线路.Based on periodically poled lithium niobate （PPLN） waveguides, an all-optical single- photon wavelength conversion scheme is proposed, in which a cascaded sum-frequency generation （SFG） and difference-frequency generation （DFG） are applied. In the Heisenberg picture, the annihilation operators of target photon are obtained by using the Hamiltonian of nonlinear conversion process. According to the efficiency of the single-photon wavelength converter, that is, the ratio of the value of photon number operator after conversion to the value before conversion, the relation of the efficiencies of the single-photon wavelength converters in the SFG and DFG process with the pump power are analyzed. The result that there exists an optimum pump power with which the quantum state can be transferred completely is demonstrated. Numerical analysis results show that the efficiency of single-photon wavelength conversion from 1 550 nm to 1 530 nm is about 61~//00 when the pump power of up-converter is 65 mW and the pump power of the down-converter is 150 roW, respectively. In addition, an experimental setup is also proposed, which consists of PPLN waveguides, pump lasers, quasi-single photon source, optical components, e.g. filtering, single photon detector （SPD） and synchronization circuit.

关 键 词：全光单光子波长变换 和频产生 差频产生 周期极化铌酸锂波导 

分 类 号：TN918.91[电子电信—通信与信息系统] O431.2[电子电信—信息与通信工程]