A microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits

• URL: http://arxiv.org/abs/2504.21346v1
• Date: Wed, 30 Apr 2025 06:16:16 GMT
• Title: A microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
• Authors: Kui Zhao, Wei-Guo Ma, Ziting Wang, Hao Li, Kaixuan Huang, Yun-Hao Shi, Kai Xu, Heng Fan,
• Abstract summary: We propose a microwave-activated three-qubit gate protocol for fixed-frequency transmon qubits in the large-detuning regime.<n> numerical simulations demonstrate a high average gate fidelity exceeding $99.9%$.<n>This strategy advances scalable quantum computing systems by improving coherence properties, reducing spectral congestion, and expanding the experimental toolkit for error-resilient quantum operations.
• Score: 18.285015455084935
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Scalable superconducting quantum processors require balancing critical constraints in coherence, control complexity, and spectral crowding. Fixed-frequency architectures suppress flux noise and simplify control via all-microwave operations but remain limited by residual ZZ crosstalk. Here we propose a microwave-activated three-qubit gate protocol for fixed-frequency transmon qubits in the large-detuning regime ($|\Delta| \gg g$), leveraging the third-order nonlinear interaction to coherently exchange $|001\rangle \leftrightarrow |110\rangle$ states. By incorporating a phase-compensated optimization protocol, numerical simulations demonstrate a high average gate fidelity exceeding $99.9\%$. Systematic error analysis identifies static long-range ZZ coupling as the dominant error source in multi-qubit systems, which can be suppressed via operations in the large-detuning regime ($\sim 1$ GHz). This approach simultaneously enhances gate fidelity while preserving spectral isolation, ensuring compatibility with existing all-microwave controlled-Z gate frameworks. The protocol exhibits intrinsic robustness to fabrication-induced qubit parameter variations. This hardware-efficient strategy advances scalable quantum computing systems by improving coherence properties, reducing spectral congestion, and expanding the experimental toolkit for error-resilient quantum operations in the noisy intermediate-scale quantum era.

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