Error correction of a logical qubit encoded in a single atomic ion

Kyle DeBry et al. · 2025 · Nature Physics

| 编号 QE357 | 主题 硬件实验与里程碑 | 链接 arXiv:2503.13908 |

摘要

摘要保留原文（英文）

摘要取自 arXiv / 出版方元数据，未作翻译，以保证与原文一致。

Quantum error correction is essential for quantum computers to run useful algorithms, but large-scale fault-tolerant computation remains limited by requirements for operation fidelity and the number of controllable qubits. Traditional schemes encode each logical qubit into multiple physical qubits, increasing resource demands and complexity. Recent theoretical work has proposed a complementary approach that performs error correction at the level of single qubits by using additional internal quantum states, which could reduce overhead. This approach has not yet been demonstrated experimentally, partly due to the difficulty of performing error measurements and subsequent error correction with high fidelity. Here we demonstrate a quantum error-correction protocol in a single atomic ion that reduces errors by up to a factor of 2.2 and extends the qubit lifetime by a factor of up to 1.5 compared with an unencoded qubit. We encode the qubit in spin-cat logical states and implement an autonomous correction scheme that operates without mid-circuit measurements of an ancilla. The approach is applicable to a range of finite-dimensional quantum platforms and could serve either as a component

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