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24 Days-Stable CNOT Gate on Fluxonium Qubits with Over 99.9% Fidelity
Over the past decade, researchers have been dedicated to developing robust entangling gates with over 99.9% fidelity on superconducting qubits, aiming to surpass the threshold for quantum error correction and enable fault-tolerant quantum computing within the constraints of modern hardware. However, achieving this goal has been hindered by several challenges.
Voltage-activated parametric entangling gates based on gatemon qubits
We describe the generation of entangling gates on superconductor-semiconductor hybrid qubits by ac voltage modulation of the Josephson energy. Our numerical simulations demonstrate that the unitary error can be below 10−5 in a variety of 75-ns-long two-qubit gates (CZ, iSWAP, and iSWAP) implemented using parametric resonance.
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