Electric field dependence of spin qubit in a Si-MOS quantum dot  

作　　者：马荣龙 倪铭 周雨晨 孔真真 王桂磊 刘頔 罗刚 曹刚 李海欧 郭国平 Rong-Long Ma;Ming Ni;Yu-Chen Zhou;Zhen-Zhen Kong;Gui-Lei Wang;Di Liu;Gang Luo;Gang Cao;Hai-Ou Li;Guo-Ping Guo(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Microelectronics Devices and Integrated Technology,Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China;Beijing Superstring Academy of Memory Technology,Beijing 100176,China;Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China;Origin Quantum Computing Company Limited,Hefei 230026,China)

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]Key Laboratory of Microelectronics Devices and Integrated Technology,Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China [4]Beijing Superstring Academy of Memory Technology,Beijing 100176,China [5]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China [6]Origin Quantum Computing Company Limited,Hefei 230026,China

出　　处：《Chinese Physics B》2024年第6期248-253,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 12074368, 92165207, 12034018, and 92265113);the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302300);the Anhui Province Natural Science Foundation (Grant No. 2108085J03);the USTC Tang Scholarship。

摘　　要：Valley, the intrinsic feature of silicon, is an inescapable subject in silicon-based quantum computing. At the spin–valley hotspot, both Rabi frequency and state relaxation rate are significantly enhanced. With protection against charge noise, the valley degree of freedom is also conceived to encode a qubit to realize noise-resistant quantum computing.Here, based on the spin qubit composed of one or three electrons, we characterize the intrinsic properties of valley in an isotopically enriched silicon quantum dot(QD) device. For one-electron qubit, we measure two electric-dipole spin resonance(EDSR) signals which are attributed to partial occupation of two valley states. The resonance frequencies of two EDSR signals have opposite electric field dependences. Moreover, we characterize the electric field dependence of the upper valley state based on three-electron qubit experiments. The difference of electric field dependences of the two valleys is 52.02 MHz/V, which is beneficial for tuning qubit frequency to meet different experimental requirements. As an extension of electrical control spin qubits, the opposite electric field dependence is crucial for qubit addressability,individual single-qubit control and two-qubit gate approaches in scalable quantum computing.

关 键 词：silicon-based quantum computing VALLEY electric-dipole spin resonance 

分 类 号：O469[理学—凝聚态物理]