Journal
NPJ QUANTUM INFORMATION
Volume 8, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41534-022-00644-x
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Funding
- Russian Science Foundation [21-72-30026, 74300]
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Researchers presented a two-qubit fluxonium-based quantum processor, demonstrating fSim-type and controlled-Z gates with fidelities of 99.55% and 99.23%, respectively, while suppressing residual ZZ interaction to the few kHz levels. High-fidelity single-qubit gates and ground state initialization were achieved using a galvanically coupled flux control line.
Superconducting fluxonium qubits provide a promising alternative to transmons on the path toward large-scale superconductor-based quantum computing due to their better coherence and larger anharmonicity. A major challenge for multi-qubit fluxonium devices is the experimental demonstration of a scalable crosstalk-free multi-qubit architecture with high-fidelity single-qubit and two-qubit gates, single-shot readout, and state initialization. Here, we present a two-qubit fluxonium-based quantum processor with a tunable coupler element. We experimentally demonstrate fSim-type and controlled-Z-gates with 99.55 and 99.23% fidelities, respectively. The residual ZZ interaction is suppressed down to the few kHz levels. Using a galvanically coupled flux control line, we implement high-fidelity single-qubit gates and ground state initialization with a single arbitrary waveform generator channel per qubit.
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