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首页> 外文会议>International conference on laser physics 2010 >Controllable quantum states through cascaded parametric processes in superlattices
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Controllable quantum states through cascaded parametric processes in superlattices

机译：通过超晶格中的级联参数过程可控制的量子态

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We investigate production of three-photon and four-photon states in cascaded parametric processes of photon splitting and summing in χ (2)nonlinear media, under action of pump field. Generation of photon triplets using simultaneously phase matched three-photon processes: ω0↔ω1+ω2 , ω2↔ω1+ω1 , is considered in dual-grating layered structure that involves nonlinear and linear segments. The production of heralded two-photon entangled states from three-photon states is analyzed for this configuration by using the method of conditional detection of auxiliary photons. Cascaded four-photon downconversion based on simultaneously phase matched three-photon processes: ω0↔ω2 +ω2 , ω2↔ω1+ω1 is arranged for phase-reversed configuration. The effects of correlation between photons in both three-photon and four-photon states is analyzed in the regimes of amplification of corresponding modes at the frequency of three-photon downconversion ω1 = ω0/3 and the frequency of four-photon down-conversion ω1 = ω0/4respectively for both cascaded systems.
机译：我们研究在泵浦电场作用下，在χ（2）非线性介质中光子分裂和求和的级联参数过程中三光子和四光子状态的产生。在同时包含非线性和线性部分的双光栅分层结构中，考虑了使用同时相位匹配的三光子过程ω0↔ω1+ω2，ω2↔ω1+ω1来生成光子三元组。通过使用辅助光子的条件检测方法，针对这种配置分析了由三光子状态产生的预告二光子纠缠态。基于同时相位匹配的三光子过程：ω0↔ω2+ω2，ω2↔ω1+ω1的级联四光子降频转换用于反相配置。在三光子下变频频率ω1=ω0/ 3和四光子下变频频率ω1的相应模式的放大方式下，分析了三光子和四光子状态下光子之间的相关性影响。对于两个级联系统分别为ω0/ 4。

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