Gate Error Analysis of Tunable Coupling Architecture in the Large-scale Superconducting Quantum System

• URL: http://arxiv.org/abs/2212.04239v1
• Date: Thu, 8 Dec 2022 12:43:57 GMT
• Title: Gate Error Analysis of Tunable Coupling Architecture in the Large-scale Superconducting Quantum System
• Authors: Dowon Baek, Seong Hyeon Park, Suhwan Choi, Chanwoo Yoo, and Seungyong Hahn
• Abstract summary: 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. Our study provides software-oriented and hardware-level guidelines for building a large-scale fault-tolerant quantum system.
• Score: 1.046632165836774
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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