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Abstract
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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1 National University of Science and Technology ‘MISIS’, Moscow, Russia (GRID:grid.35043.31) (ISNI:0000 0001 0010 3972); Russian Quantum Center, Skolkovo, Russia (GRID:grid.452747.7)
2 National University of Science and Technology ‘MISIS’, Moscow, Russia (GRID:grid.35043.31) (ISNI:0000 0001 0010 3972); Russian Quantum Center, Skolkovo, Russia (GRID:grid.452747.7); Moscow Institute of Physics and Technology, Dolgoprudny, Russia (GRID:grid.18763.3b) (ISNI:0000000092721542)
3 National University of Science and Technology ‘MISIS’, Moscow, Russia (GRID:grid.35043.31) (ISNI:0000 0001 0010 3972)
4 Dukhov Research Institute of Automatics (VNIIA), Moscow, Russia (GRID:grid.472660.1) (ISNI:0000 0004 0544 1518); Bauman Moscow State Technical University, FMN Laboratory, Moscow, Russia (GRID:grid.61569.3d) (ISNI:0000 0001 0405 5955)
5 National University of Science and Technology ‘MISIS’, Moscow, Russia (GRID:grid.35043.31) (ISNI:0000 0001 0010 3972); Russian Quantum Center, Skolkovo, Russia (GRID:grid.452747.7); ETH Zurich, Department of Physics, Zurich, Switzerland (GRID:grid.5801.c) (ISNI:0000 0001 2156 2780)