Two channels of entangled twin photons generated by quasi-phase-matched spontaneous parametric down-conversion in periodically poled lithium niobate crystals

被引:3
作者
Gao, Shiming [1 ,2 ,3 ]
Yang, Changxi [4 ]
机构
[1] Royal Inst Technol, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, Stockholm, Sweden
[2] Zhejiang Univ, Hangzhou 310058, Zhejiang, Peoples R China
[3] Royal Inst Technol, Joint Res Ctr Photon, Stockholm, Sweden
[4] Tsinghua Univ, Dept Precis Instruments, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China
关键词
D O I
10.1364/JOSAB.25.000734
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose the generation of two-channel time-energy entangled twin photons based on two simultaneous first-order quasi-phase-matched (QPM) spontaneous parametric down-conversion processes in a periodically poled lithium niobate (PPLN) with a monochromatic pump. The theoretical model for the generation of the entangled photons is established, and the analytical solution is obtained in a lossless crystal with an undepleted pump assumption. The generated condition of entangled photons is achieved in terms of the QPM grating period and the pump wavelength. It is shown that two channels of entangled twin photons with different wavelengths can be created by suitably choosing the PPLN grating period once the pump wavelength is fixed, which provides the potential to introduce the wavelength division multiplexed technique into quantum information systems. (c) 2008 Optical Society of America.
引用
收藏
页码:734 / 740
页数:7
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