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Hanyang University researchers have demonstrated a fixed-frequency transmon processor with CNOT gate fidelities exceeding 0.98 in six connectivity directions, directly resolving frequency crowding issues that hinder surface-code scaling. By aligning the hardware lattice-patch architecture natively with logical qubit requirements, this design eliminates complex software adjustments and enhances resilience against flux noise for fault-tolerant quantum computation.

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Hanyang University Team Designs Lattice-Patch Architecture for Surface-Code Mapping

Quantum ZeitgeistJuly 22, 20264 min read

CNOT gate fidelities now exceed 0. 98 across all six connectivity directions within a newly designed quantum processor. This performance surpasses previous methods by directly addressing frequency crowding and inefficient mapping onto the surface code, key obstacles to scaling superconducting qubits.

Scientists at Hanyang University have developed a new lattice-patch architecture to address critical limitations in superconducting transmon processors, a prominent platform for building large-scale quantum computers. Chanpyo Kim and colleagues demonstrate a method of coupling four fixed-frequency transmons to a single coupler, significantly enhancing qubit connectivity and streamlining the process of mapping onto the surface-code lattice. This entirely fixed-frequency design mitigates susceptibility to external flux noise and achieves CNOT gate fidelities exceeding 0.98 across all connectivity directions within the patch, representing a…

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