基于催化式KLM型干涉实现非高斯量子态的制备及非经典性研究  

The Generation and Nonclassicality of Non-Gaussian Quantum State Based on Catalytic Knill-Laflamme-Milburn Interference

作　　者：张欢 叶炜 周维东[2] 胡利云 ZHANG Huan;YE Wei;ZHOU Wei-dong;HU Li-yun(Center for Quantum Science and Technology,Jiangxi Normal University,Nanchang 330022,China;Key Laboratory of Optoelectronic and Telecommunication,Jiangxi Normal University,Nanchang 330022,China;School of Information Science and Engineering,Central South University,Changsha 410083,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]江西师范大学物理与通信电子学院,江西南昌330022 [3]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《聊城大学学报（自然科学版）》2019年第6期21-27,共7页Journal of Liaocheng University:Natural Science Edition

基　　金：国家自然科学基金项目（11664017,11464018）资助

摘　　要：作为一种常见的量子资源,非高斯量子态在连续变量量子信息处理中发挥着重要作用.本文考虑单模压缩态作为输入态,通过Knill-Laflamme-Milburn(KLM)型SU(3)干涉操作后,实现一种新型非高斯量子态的制备.利用Wigner函数的相空间分布,研究发现,通过调控输入态的压缩参数和KLM模型中三个光束分离器的反射率,可以实现非高斯态的高探测概率以及获得高非经典特性.特别是,在大压缩参数和低反射率区域中,所制备非高斯态的Wigner函数呈现出明显的负部体积特征.这些研究为实现长距离量子安全通信提供了理论指导.As a common quantum resource,non-Gaussian quantum states play an important role in the continuous variable quantum information processing.With inputting a single-mode squeezed state,in this paper,a new kind of non-Gaussian quantum state is prepared by Knill-Laflamme-Milburn (KLM) type SU(3) interference operation.Subsequently,its detection probability and nonclassicality are investigated.It is found that by modulating the squeezed parameters of the input state and the reflectivity of the three beam splitters in the KLM model,the high detection probability and high nonclassicality of the prepared non-Gaussian state can be achieved.In particular,in the large squeezed parameters and low reflectance regions,the Wigner function of the prepared non-Gaussian state exhibits a significant negative volume feature.These studies may provide theoretical guidance for achieving long-range quantum secure communication.

关 键 词：Knill-Laflamme-Milburn型 非高斯操作 单模压缩真空态 量子剪切 

分 类 号：O413.1[理学—理论物理]