CAJ | 학술논문

基于量子相干原理,分析了脉冲激光泵浦的第二类型自发参量下转换产生的同频率纠缠双光子态.研究了同频率纠缠双光子的量子相干性质,并与由脉冲激光所产生的不同频率纠缠双光子的量子相干性质做了对比.结果表明,随着激光脉冲宽度的增加,不同频率纠缠双光子态的相位匹配函数的不对称性增加,纠缠光子对的相干性减小,同频率纠缠双光子态的相位匹配函数仍保持对称,纠缠光子对的相干性达到最大.
기우양자상간원리,분석료맥충격광빙포적제이류형자발삼량하전환산생적동빈솔규전쌍광자태.연구료동빈솔규전쌍광자적양자상간성질,병여유맥충격광소산생적불동빈솔규전쌍광자적양자상간성질주료대비.결과표명,수착격광맥충관도적증가,불동빈솔규전쌍광자태적상위필배함수적불대칭성증가,규전광자대적상간성감소,동빈솔규전쌍광자태적상위필배함수잉보지대칭,규전광자대적상간성체도최대.
Based on the principle of quantum coherent, the entangled biphoton state with in frequency-coincident pumped by spontaneous type-Ⅱ parametric down-conversion is analyzed. The quantum coherent properties of this system are researched and compared with that of the frequeney-different biphoton. The results showed that as increasing the pump band-width, the asymmetry of the phase-matching Junction of the frequency-different biphoton state is increased, and then the coherence of entangled biphoton is diminished. However, the phase-matching function of the frequency-coincident biphoton state is still symmetric, and the coherence of entangled biphoton is best.