基于量子点-双边光学腔的两自由度并行非定域Toffoli门远程实现  

Hyper-parallel nonlocal Toffoli gates assisted by quantum dots inside a double-side optical microcavity

作　　者：陆湘琪 王译柳 陈孟钒 杨真仙 黄翠钰 周萍[1,2] LU XiangQi;WANG YiLiu;CHEN MengFan;YANG ZhenXian;HUANG CuiYu;ZHOU Ping(Key Lab of Quantum Information and Quantum Optics,Guangxi Minzu University,Nanning 530006,China;College of Mathematics and Physics,Guangxi Minzu University,Nanning 530006,China)

机构地区：[1]广西民族大学量子信息与量子光学重点实验室,南宁530006 [2]广西民族大学数学与物理学院,南宁530006

出　　处：《中国科学：物理学、力学、天文学》2022年第12期50-60,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：广西自然科学基金(编号:2018JJA110112);国家自然科学基金(编号:61501129,11564004)资助项目。

摘　　要：三量子比特Toffoli门非定域远程实现在量子通讯网络、分布式量子计算中有重要应用.已有的Toffoli门非定域远程实现方案大都基于量子系统单一自由度,本文提出超纠缠信道下基于量子点-双边光学腔的两自由度并行非定域Toffoli门远程实现方案.通讯方Alice,Bob使手中光子依次进入量子点-双边光学腔,对光学腔中电子以及纠缠光子执行单粒子测量;Charlie依据纠缠光子单粒子测量结果,执行相应局域幺正操作和极化、路径自由度单粒子测量.Alice和Bob依据单粒子测量结果执行相应局域幺正变换即可完成两自由度并行非定域Toffoli门远程实现.方案以极化、路径两自由度超纠缠光子为量子纠缠信道,具有信道容量高、并行性强的优点.Implementing three-qubit Toffoli gates nonlocally plays an important role in quantum communication networks and distributed quantum computation.Most of previous protocols for implementing quantum Toffolis gate consider only implementing Toffoli gates with one degree of freedom.In this paper,we present a scheme for parallel implementation of nonlocal Toffoli gates in polarization and spatial-mode degrees of freedom assisted by quantum dots inside a double-side optical microcavity.Alice and Bob let photons traverse the double-side optical microcavity sequentially and perform single-particle measurements on electron spin in quantum dots and the entangled photons.Charlie performs singleparticle measurements and applies the corresponding unitary operation in polarization and spatial-mode degrees of freedom according to Alice and Bob’s measurement results.Alice and Bob can implement hyper-parallel nonlocal Toffoli gates by performing unitary operations according to Charlie’s measurement result.This protocol has the advantage of having high channel capacity by the hyperentangled state as the quantum channel.

关 键 词：并行非定域Toffoli门 超纠缠 量子点-双边光学腔 

分 类 号：O431.2[机械工程—光学工程]