非高斯操作对双模压缩真空态量子导引的改善  

The Improvement of Quantum Steering in Two Mode Squeezed Vacuum State by Non-Gaussian Operation

作　　者：孙继峰 康晴茜 赵泽坤 赵腾 刘寸金 胡利云 SUN Jifeng;KANG Qingxi;ZHAO Zekun;ZHAO Teng;LIU Cunjin;HU Liyun(Center for Quantum Science and Technology,Jiangxi Normal University,Nanchang Jiangxi 330022,China;Department of Physics,College of Science and Technology,Jiangxi Normal University,Nanchang Jiangxi 330022,China)

机构地区：[1]江西师范大学量子科学与技术中心,江西南昌330022 [2]江西师范大学科学技术学院物理系,江西南昌330022

出　　处：《江西师范大学学报（自然科学版）》2024年第4期346-350,共5页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：国家自然科学基金(11964013);江西省主要学术和技术带头人培养计划——领军人才项目(20204BCJL22053);江西省自然科学基金(20242BAB2600)资助项目.

摘　　要：量子导引是量子信息处理的关键资源之一,它天然的不对称性为量子信息处理提供了安全性与广阔的应用前景;光子损耗的存在会降低量子系统的导引,从而影响其性能.该文将光子数守恒非高斯操作作用于双模压缩真空态,有效地改善了量子导引.基于协方差矩阵度量量子导引的方法,考察了当存在单侧噪声时,光子数守恒对单向和双向量子导引的改善情况.研究结果表明:光子数守恒操作不仅能提高双模压缩真空态的量子导引程度,还能在更高损耗条件下保持双向导引.Quantum Steering is one of the key resources in quantum information processing,providing inherent asymmetry that enhances security and enables a wide range of applications.However,the presence of photon loss can diminish the steerability of quantum systems,thereby impacting their performance.The non-Gaussian operation(photon number-conserving)is used to a two-mode squeezed vacuum state to effectively enhance its quantum guidance.Using the covariance matrix to measure Quantum Steering,the improvement of one-way and two-way Quantum Steering in the presence of unilateral noise is examined when photon number conservation is implemented.The study showes that photon number conservation not only enhances the steerability of the two-mode squeezed vacuum state but also maintains bidirectional steering under higher loss conditions.

关 键 词：双模压缩真空态 非高斯操作 量子导引 

分 类 号：O431.2[机械工程—光学工程]