www.nature.com/articles/s41586-026-10822-y.pdf

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二重レール消去量子ビットのためのエンタングルゲート

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This document describes the design and realization of a two-qubit entangling gate for dual-rail erasure qubits. Quantum error correction (QEC) is essential for the advancement of quantum computing, yet it requires low error rates in physical qubits. Erasure qubits enhance error hierarchy, making them advantageous for QEC. The study experimentally demonstrates an entangling gate for erasure qubits encoded in superconducting microwave cavities, confirming that the error hierarchy is largely preserved. The gate operates at approximately 500 ns with a low error rate of about 0.5% and keeps Pauli errors below 0.1%. These results pave the way for faster error-corrected systems, supporting the transition to effective QEC.