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The R2D pulse-shaping method reduces leakage into non-computational transmon states, which is a useful gain for gate-level control in superconducting qubits. The reported fidelities are from interleaved randomized benchmarking on a single qubit, so the practical value depends on whether the approach holds up across multi-qubit devices, where crosstalk and calibration overhead become the limiting factors.

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Forschungszentrum Jülich Demonstrates 6.8-Nanosecond Single-Qubit Gates with > 99.98% Fidelity via Multi-Photon Leakage Suppression

Quantum Computing ReportOctober 31, 20263 min read

Physicists at Forschungszentrum Jülich, RWTH Aachen University, and the University of Cologne have achieved record-breaking 6.8-nanosecond single-qubit gate operations with over 99.98% fidelity on a superconducting transmon processor. Their "R2D" pulse-shaping method effectively suppresses multi-photon leakage, allowing for ultrafast gates while maintaining high fidelity. This advancement, detailed in Nature Communications, marks a significant step in quantum computing, though scaling to multi-qubit systems presents future challenges. The post Forschungszentrum Jülich Demonstrates 6.8-Nanosecond Single-Qubit Gates with > 99.98% Fidelity via Multi-Photon Leakage Suppression appeared first on Quantum Computing Report.

Schematic of qubit level structures and pulse shapes for fast gates. Physicists at Forschungszentrum Jülich, RWTH Aachen University, and the University of Cologne have achieved single-qubit gate operations lasting 6.8 nanoseconds with gate fidelities exceeding 99.98% on a superconducting transmon processor. Detailed in Nature Communications under the…

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