基于多光子叠加态的交叉相位调制耦合参数测量  

The measurement of the cross-phase modulation coupling parameter based on multiphoton superposition state

作　　者：何天宇[1] 林志 李曦坤 杨青[1] 杨名[1] HE Tianyu;LIN Zhi;LI Xikun;YANG Qing;YANG Ming(School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学物理与光电工程学院,安徽合肥230601

出　　处：《安徽大学学报（自然科学版）》2024年第1期43-49,共7页Journal of Anhui University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11947102,12004005);安徽省自然科学基金资助项目(2008085MA16,2008085QA26);安徽省高校协同创新项目(GXXT-2022-039);安徽省高校杰出青年基金资助项目(2022AH020008)。

摘　　要：继纠缠之后,粒子间相互作用已成为量子增强的重要资源.在不利用纠缠资源的前提下,已有研究工作利用单光子叠加态与相干态的相互作用实现了精度为海森堡极限的参数测量,然而海森堡极限并不是这个相互作用模型的测量精度极限.为了得到更高的测量精度,将单光子叠加态替换为多光子叠加态,在弱测量框架下对信号光量子态进行后选择与量子态筛选.将单光子叠加态替换为多光子叠加态,能为测量结果带来全方位提升.提出基于多光子叠加态的交叉相位调制耦合参数测量的物理方案,该物理方案具有搭建难度低及操作简单的优点.Following entanglement,interactions between particles have become an important resource for quantum enhancement.Without utilizing the entanglement resource,the interaction between a single-photon superposition state and a coherent state has been used to achieve parameter measurements with the accuracy of the Heisenberg limit.However,the Heisenberg limit is not the limit of the optimal measurement accuracy of this interaction model.In order to obtain higher measurement accuracy,the single-photon superposition state was replaced by a multiphoton superposition state,and the signal state was post-selected and screened in a weak measurement framework.Replacing the single-photon superposition state with the multiphoton superposition state could bring all-round improvement to the measurement results.A physical scheme for the measurement of cross-phase modulation coupling parameters based on the multiphoton superposition state was presented.The physical scheme had the advantages of low construction difficulty and simple operation.

关 键 词：弱测量 光子数态 费舍信息 交叉相位调制 

分 类 号：O431.2[机械工程—光学工程]