Remote entangling gate between a quantum dot spin and a transmon qubit mediated by microwave photons
Xing-Yu Zhu(朱行宇)1,2, Le-Tian Zhu(朱乐天)1, Tao Tu(涂涛)1,3,†, and Chuan-Feng Li(李传锋)1,3,‡
1 Key Laboratory of Quantum Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230026, China; 2 School of Mechanical and Electronic Engineering, Suzhou University, Suzhou 234000, China; 3 Hefei National Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230088, China
Abstract Spin qubits and superconducting qubits are promising candidates for realizing solid-state quantum information processors. Designing a hybrid architecture that combines the advantages of different qubits on the same chip is a highly desirable but challenging goal. Here we propose a hybrid architecture that utilizes a high-impedance SQUID array resonator as a quantum bus, thereby coherently coupling different solid-state qubits. We employ a resonant exchange spin qubit hosted in a triple quantum dot and a superconducting transmon qubit. Since this hybrid system is highly tunable, it can operate in a dispersive regime, where the interaction between the different qubits is mediated by virtual photons. By utilizing such interactions, entangling gate operations between different qubits can be realized in a short time of 30 ns with a fidelity of up to 96.5% under realistic parameter conditions. Further utilizing this interaction, remote entangled state between different qubits can be prepared and is robust to perturbations of various parameters. These results pave the way for exploring efficient fault-tolerant quantum computation on hybrid quantum architecture platforms.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974336 and 12304401), the National Key R&D Program of China (Grant No. 2017YFA0304100), the Key Project of Natural Science Research in Universities of Anhui Province (Grant No. KJ2021A1107), and the Scientific Research Foundation of Suzhou University (Grant Nos. 2020BS006 and 2021XJPT18).
Corresponding Authors:
Tao Tu, Chuan-Feng Li
E-mail: tutao@ustc.edu.cn;licf@ustc.edu.cn
Cite this article:
Xing-Yu Zhu(朱行宇), Le-Tian Zhu(朱乐天), Tao Tu(涂涛), and Chuan-Feng Li(李传锋) Remote entangling gate between a quantum dot spin and a transmon qubit mediated by microwave photons 2024 Chin. Phys. B 33 020315
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