Qubit-qubit quantum coherence mediated by an epsilon-near-zero waveguide  

作　　者：Zhenhua Yin Jicheng Wang Yueke Wang Yun Zhu Mengmeng Li Sergei Khakhomov Zheng-Da Hui 

机构地区：[1]School of Science,Jiangnan University,Wuxi 214122,China [2]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,Shenzhen 518060,China [3]Department of Communication Engineering,Nanjing University of Science and Technology,Nanjing 210000,China [4]Departments of Optics and General Physics,Francisk Skorina Gomel State University,Sovetskaya Str.104,Gomel 246019,Belarus

出　　处：《Communications in Theoretical Physics》2024年第12期50-59,共10页理论物理通讯(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFE0122300);the Natural Science Foundation of Jiangsu Province(Grant No.BK20231493);the Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province(Grant No.GD202405)。

摘　　要：Quantum coherence,as a more general quantum resource compared to quantum entanglement,has attracted increasing attention over recent years.Establishing stable quantum coherence is crucial for implementing reliable quantum information tasks.In this study,we propose a scheme to generate stable quantum coherence of two qubits via an epsilon-near-zero(ENZ)waveguide.We find that employing Si3N4rather than SiO2results in stronger qubit-qubit coupling and maximal quantum coherence in a certain range.We derive analytical expressions for both quantum coherence and quantum entanglement,allowing for direct comparison within a unified framework.To achieve stable quantum coherence,classical field driving is introduced.We find that stable coherence is much larger and easier mediated than that of stable entanglement.Our work contributes to the creation of a new stable quantum resource via an ENZ waveguide.

关 键 词：quantum coherence quantum entanglement metamaterial epsilon-near-zero waveguide dyadic Green’s function 

分 类 号：O413[理学—理论物理]