Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912652637241344 |
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| author | Zhao, Kui Ma, Wei-Guo Wang, Ziting Li, Hao Huang, Kaixuan Shi, Yun-Hao Xu, Kai Fan, Heng |
| author_facet | Zhao, Kui Ma, Wei-Guo Wang, Ziting Li, Hao Huang, Kaixuan Shi, Yun-Hao Xu, Kai Fan, Heng |
| contents | 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 ($|Δ| \gg g$), leveraging the third-order nonlinear interaction to coherently exchange $\ket{001} \leftrightarrow \ket{110}$ 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). The protocol maintains process fidelities exceeding $98\%$ under decoherence, while demonstrating intrinsic robustness to fabrication-induced parameter variations and compatibility with existing all-microwave two-qubit gate architectures. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_21346 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits Zhao, Kui Ma, Wei-Guo Wang, Ziting Li, Hao Huang, Kaixuan Shi, Yun-Hao Xu, Kai Fan, Heng Quantum Physics Other Condensed Matter Applied Physics 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 ($|Δ| \gg g$), leveraging the third-order nonlinear interaction to coherently exchange $\ket{001} \leftrightarrow \ket{110}$ 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). The protocol maintains process fidelities exceeding $98\%$ under decoherence, while demonstrating intrinsic robustness to fabrication-induced parameter variations and compatibility with existing all-microwave two-qubit gate architectures. 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. |
| title | Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits |
| topic | Quantum Physics Other Condensed Matter Applied Physics |
| url | https://arxiv.org/abs/2504.21346 |