24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity
Fluxonium qubit is a promising elementary building block for quantum information processing due to its long coherence time combined with a strong anharmonicity. In this paper, we realize a 60-ns direct cnot gate on two inductively coupled fluxoniums, which behave almost exactly as a pair of transver...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-03-01
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| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.6.010349 |
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| author | Wei-Ju Lin Hyunheung Cho Yinqi Chen Maxim G. Vavilov Chen Wang Vladimir E. Manucharyan |
| author_facet | Wei-Ju Lin Hyunheung Cho Yinqi Chen Maxim G. Vavilov Chen Wang Vladimir E. Manucharyan |
| author_sort | Wei-Ju Lin |
| collection | DOAJ |
| description | Fluxonium qubit is a promising elementary building block for quantum information processing due to its long coherence time combined with a strong anharmonicity. In this paper, we realize a 60-ns direct cnot gate on two inductively coupled fluxoniums, which behave almost exactly as a pair of transversely coupled spin-1/2 systems. The cnot-gate fidelity, estimated using randomized benchmarking, was as high as 99.94%. Furthermore, the fidelity remains above 99.9% for 24 days without any recalibration between measurements. Compared with the 99.96% fidelity of a 60-ns identity gate, our data brings the investigation of the nondecoherence-related errors during logical operations down to 2×10^{−4}. The present result adds a simple and robust two-qubit gate into the still relatively small family of the “beyond three nines” gates on superconducting qubits. |
| format | Article |
| id | doaj-art-4866e3a2f01e4020b73e83a0e23fa612 |
| institution | OA Journals |
| issn | 2691-3399 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj-art-4866e3a2f01e4020b73e83a0e23fa6122025-08-20T01:57:24ZengAmerican Physical SocietyPRX Quantum2691-33992025-03-016101034910.1103/PRXQuantum.6.01034924 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% FidelityWei-Ju LinHyunheung ChoYinqi ChenMaxim G. VavilovChen WangVladimir E. ManucharyanFluxonium qubit is a promising elementary building block for quantum information processing due to its long coherence time combined with a strong anharmonicity. In this paper, we realize a 60-ns direct cnot gate on two inductively coupled fluxoniums, which behave almost exactly as a pair of transversely coupled spin-1/2 systems. The cnot-gate fidelity, estimated using randomized benchmarking, was as high as 99.94%. Furthermore, the fidelity remains above 99.9% for 24 days without any recalibration between measurements. Compared with the 99.96% fidelity of a 60-ns identity gate, our data brings the investigation of the nondecoherence-related errors during logical operations down to 2×10^{−4}. The present result adds a simple and robust two-qubit gate into the still relatively small family of the “beyond three nines” gates on superconducting qubits.http://doi.org/10.1103/PRXQuantum.6.010349 |
| spellingShingle | Wei-Ju Lin Hyunheung Cho Yinqi Chen Maxim G. Vavilov Chen Wang Vladimir E. Manucharyan 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity PRX Quantum |
| title | 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity |
| title_full | 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity |
| title_fullStr | 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity |
| title_full_unstemmed | 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity |
| title_short | 24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity |
| title_sort | 24 days stable cnot gate on fluxonium qubits with over 99 9 fidelity |
| url | http://doi.org/10.1103/PRXQuantum.6.010349 |
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