由单自旋量子比特稳定的仅交换量子比特
Exchange-only qubit stabilized by a single-spin qubit
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中文总结 AI 辅助
该研究将Loss-DiVincenzo方案与仅交换量子比特结合，实现了仅单重态仅交换量子比特的误差检测与容错π旋转，抑制了误差传播，为半导体基量子计算的容错门构建提供了新视角。
中文摘要 AI 辅助
结合不同自旋量子比特编码的混合方法具有良好的应用前景。特别是，仅交换量子比特及其扩展形式所具备的额外自由度可延长自旋寿命，并借助辅助自旋实现误差检测。我们证明，将Loss-DiVincenzo方案与仅交换量子比特相结合，可在保持与自旋输运架构兼容的同时，为实现这些优势提供可行途径。我们进一步展示了仅单重态的仅交换量子比特如何用于误差检测，并提出了针对（仅单重态）仅交换量子比特三个控制轴各自的容错π旋转。通过在最低编码级别实现误差检测，我们的方法可有效将电荷和核噪声转化为擦除错误，从而抑制误差传播，并可能提升量子纠错方案的性能。更广泛地说，我们的工作为仅单重态的仅交换量子比特作为逻辑编码建立了新视角，为半导体基量子计算的容错门构建和自旋定制量子纠错协议打开了大门。
英文摘要
Hybrid approaches that combine different spin qubit encodings offer promising advantages. In particular, the additional degrees of freedom available in exchange-only qubits and their extensions enable enhanced spin lifetimes and facilitate error detection through the use of auxiliary spins. We show that integrating Loss-DiVincenzo with exchange-only qubits provides a practical route to realizing these benefits while remaining compatible with spin-shuttling architectures. We further demonstrate how the singlet-only exchange-only qubit can be employed for error detection, and we present a fault-tolerant $π$-rotation about each of the three control axes of the (singlet-only) exchange-only qubit. By enabling error detection at the lowest encoding level, our approach effectively converts charge and nuclear noise into erasures, thereby suppressing error propagation and potentially enhancing the performance of quantum error-correction schemes. More broadly, our work establishes a new perspective on the singlet-only exchange-only qubit as a logical encoding, opening the door to fault-tolerant gate constructions and spin-tailored quantum error-correction protocols for semiconductor-based quantum computing.
