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Single-flux-quantum-based qubit control with tunable driving strength

Chinese Physics B 2023年第12期32卷 623-627页

作者：刘匡王一凡季波高万鹏林志荣王镇 National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China CAS Center for Excellence in Superconducting Electronics Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China ShanghaiTech University Shanghai 201210China

Single-flux-quantum(SFQ)circuits have great potential in building cryogenic quantum-classical interfaces for scaling up superconducting quantum ***-based quantum gates have been designed and ***,current control schemes are difficult to tune the driving strength to qubits,which restricts the gate length and usually induces leakage to unwanted *** this study,we design the scheme and corresponding pulse generator circuit to continuously adjust the driving strength by coupling SFQ pulses with variable *** scheme not only provides a way to adjust the SFQ-based gate length,but also proposes the possibility to tune the driving strength *** show that our scheme can suppress leakage to unwanted levels and reduce the error of SFQ-based Clifford gates by more than an order of magnitude.

关键词： superconducting qubit qubit control single-flux-quantum(SFQ)circuit

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Superconducting quantum computing: a review

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Science China(Information Sciences) 2020年第8期63卷 59-90页

作者： He-Liang HUANG Dachao WU Daojin FAN Xiaobo ZHU Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai Branch CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum PhysicsUniversity of Science and Technology of China

Over the last two decades, tremendous advances have been made for constructing large-scale quantum computers. In particular, quantum computing platforms based on superconducting qubits have become the leading candidate for scalable quantum processor architecture, and the milestone of demonstrating quantum supremacy has been first achieved using 53 superconducting qubits in 2019. In this study, we provide a brief review on the experimental efforts towards the large-scale superconducting quantum computer,including qubit design, quantum control, readout techniques, and the implementations of error correction and quantum algorithms. Besides the state of the art, we finally discuss future perspectives, and which we hope will motivate further research.

关键词： quantum computing superconducting quantum computing quantum bit quantum algorithm qubit design qubit control qubit readout

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