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Towards high-fidelity quantum operations with fluxonium qubits: Part II-experimental progress

Hsiang‐Sheng Ku, Gengyan Zhang, Tenghui Wang +18 more

Bulletin of the American Physical SocietyMar 2, 20200 citations

Experimental realization of ultra-high fidelity qubit operations with tunable fluxonium qubits

Tenghui Wang, Jin Qin, Hao Deng +22 more

Bulletin of the American Physical SocietyMar 17, 20210 citations

High-fidelity gates on fluxonium qubits

Quentin Ficheux, Haonan Xiong, Aaron Somoroff +4 more

Bulletin of the American Physical SocietyMar 17, 20210 citations

High-fidelity entangling gates for fluxonium qubits

Feng Wu, Dawei Ding, Tenghui Wang +8 more

Bulletin of the American Physical SocietyMar 17, 20210 citations

Optimization of high-fidelity single-qubit gates for fluxonium qubits using single-flux quantum control

Maxime Lapointe-Major, Boyan T. Torosov, Bohdan Kulchytskyy +1 more

Physical Review AppliedJun 23, 20260 citations

High-fidelity QND readout and measurement back-action in a tantalum-based high-coherence fluxonium qubit

Gaurav Bothara, Srijita Das, Kishor V. Salunkhe +4 more

Implementing a precise measurement of the quantum state of a qubit is critical for building a practical quantum processor, as it plays an important role in state initialization and quantum error correction. While the transmon qubit has been the most commonly used design in small- to medium-scale processors, the fluxonium qubit is emerging as a strong alternative with the potential for high-fidelity gate operation as a result of the high anharmonicity and high coherence achievable due to its unique design. Here, we explore the measurement characteristics of a tantalum-based high-coherence fluxonium qubit and demonstrate single-shot measurement fidelity (assignment fidelity) of 96.2% ± 0.5% and 97.8% ± 0.4% without and with the use of a Josephson parametric amplifier, respectively. We study the back-action of the measurement photons on the qubit and measure a QND fidelity of 99.0% ± 0.3%. We find that the measurement fidelity and the QND nature are limited by state-mixing errors, and our results suggest that a careful study of measurement-induced transitions in the fluxonium is needed to further optimize the readout performance.Implementing a precise measurement of the quantum state of a qubit is critical for building a practical quantum processor, as it plays an important role in state initialization and quantum error correction. While the transmon qubit has been the most commonly used design in small- to medium-scale processors, the fluxonium qubit is emerging as a strong alternative with the potential for high-fidelity gate operation as a result of the high anharmonicity and high coherence achievable due to its unique design. Here, we explore the measurement characteristics of a tantalum-based high-coherence fluxonium qubit and demonstrate single-shot measurement fidelity (assignment fidelity) of 96.2% ± 0.5% and 97.8% ± 0.4% without and with the use of a Josephson parametric amplifier, respectively. We study the back-action of the measurement photons on the qubit and measure a QND fidelity of 99.0% ± 0.3%. We find that the measurement fidelity and the QND nature are limited by state-mixing errors, and our results suggest that a careful study of measurement-induced transitions in the fluxonium is needed to further optimize the readout performance.

APL QuantumApr 9, 20255 citations

Towards high-fidelity quantum operations with fluxonium qubits: Part I-design and simulation

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Towards high-fidelity quantum operations with fluxonium qubits: Part I-design and simulation

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