论文标题
大规模超导量子系统中可调耦合体系结构的栅极误差分析
Gate Error Analysis of Tunable Coupling Architecture in the Large-scale Superconducting Quantum System
论文作者
论文摘要
在本文中，我们通过使用Lindblad Master方程来求解该系统的哈密顿量，研究了在大规模量子系统中实现高保真控制的Z门的各种软件和硬件策略。首先，我们表明，最佳单参数脉冲在4 Qubit System中的40 NS Controlded-Z门上达到了$ 10^{-4} $的票据误差。其次，我们说明必须在较大规模的系统中进一步优化在隔离的2 Quibit系统中优化的脉冲，以达到低于容忍阈值的误差。最后，我们解释说，具有低门彩数的硬件参数区域的特征是大规模量子系统中的共振。我们的研究提供了面向软件和硬件级别的指南，用于构建大规模的耐故障量子系统。
In this paper, we examine various software and hardware strategies for implementing high-fidelity controlled-Z gate in the large-scale quantum system by solving the system's Hamiltonian with the Lindblad master equation. First, we show that the optimal single-parameter pulse achieved the gate error on the order of $10^{-4}$ for the 40 ns controlled-Z gate in the 4-qubit system. Second, we illustrate that the pulse optimized in the isolated 2-qubit system must be further optimized in the larger-scale system to achieve errors lower than the fault-tolerant threshold. Lastly, we explain that the hardware parameter regions with low gate fidelities are characterized by resonances in the large-scale quantum system. Our study provides software-oriented and hardware-level guidelines for building a large-scale fault-tolerant quantum system.
