High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots  

作　　者：Le-Tian Zhu Tao Tu Ao-Lin Guo Chuan-Feng Li 朱乐天;涂涛;郭奥林;李传锋(Key Laboratory of Quantum Information,University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230026,China;Hefei National Laboratory,University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230088,China)

机构地区：[1]Key Laboratory of Quantum Information,University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230026,China [2]Hefei National Laboratory,University of Science and Technology of China,Chinese Academy of Sciences,Hefei 230088,China

出　　处：《Chinese Physics B》2022年第12期50-55,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11974336);the National Key Research and Development Program of China(Grant No.2017YFA0304100)

摘　　要：Single-electron spins in quantum dots are the leading platform for qubits,while magnons in solids are one of the emerging candidates for quantum technologies.How to manipulate a composite system composed of both systems is an outstanding challenge.Here,we use spin-charge hybridization to effectively couple the single-electron spin state in quantum dots to the cavity and further to the magnons.Through this coupling,quantum dots can entangle and detect magnon states.The detection efficiency can reach 0.94 in a realistic experimental situation.We also demonstrate the electrical tunability of the scheme for various parameters.These results pave a practical pathway for applications of composite systems based on quantum dots and magnons.

关 键 词：quantum sensing magnons excitations spin qubits in quantum dots 

分 类 号：O469[理学—凝聚态物理]