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

作　　者：刘匡 王一凡 季波 高万鹏 林志荣 王镇 Kuang Liu;Yifan Wang;Bo Ji;Wanpeng Gao;Zhirong Lin;Zhen Wang(National Key Laboratory of Materials for Integrated Circuits,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]National Key Laboratory of Materials for Integrated Circuits,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]ShanghaiTech University,Shanghai 201210,China

出　　处：《Chinese Physics B》2023年第12期623-627,共5页中国物理B（英文版）

基　　金：Project supported in part by the National Natural Science Foundation of China (Grant No.92065116);the Key-Area Research and Development Program of Guangdong Province,China (Grant No.2020B0303030002);the Shanghai Technology Innovation Action Plan Integrated Circuit Technology Support Program (Grant No.22DZ1100200);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA18000000)。

摘　　要：Single-flux-quantum(SFQ)circuits have great potential in building cryogenic quantum-classical interfaces for scaling up superconducting quantum processors.SFQ-based quantum gates have been designed and realized.However,current control schemes are difficult to tune the driving strength to qubits,which restricts the gate length and usually induces leakage to unwanted levels.In this study,we design the scheme and corresponding pulse generator circuit to continuously adjust the driving strength by coupling SFQ pulses with variable intervals.This scheme not only provides a way to adjust the SFQ-based gate length,but also proposes the possibility to tune the driving strength envelope.Simulations 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 

分 类 号：O413[理学—理论物理]