发表机构
Institute of Science Tokyo; Hitachi, Ltd.; University of Tokyo（东京科学大学; 日立有限公司; 东京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对硅空穴自旋量子比特的相干时间受限问题，采用相位调制级联连续驱动技术抑制低频噪声，稳定拉比振荡并实现相干调控与噪声保护，为抗噪空穴自旋量子比特提供了可行方案。
AI 中文摘要
硅量子点中的空穴自旋因具有强本征自旋轨道耦合（SOC）而成为量子计算的有前途平台，该耦合可实现快速全电学调控。然而，这种耦合也会增加其对电荷噪声的敏感性，从而限制相干时间。此外，硅中的空穴还会受到与硅衬底中残留核自旋的超精细相互作用影响，引入不可忽略的低频噪声源。本文针对空穴自旋量子比特实现了相位调制级联连续驱动（CCD）技术，通过微波相位调制抑制低频噪声。与传统方法相比，该方法可稳定拉比振荡并延长振荡衰减时间。此外，通过在CCD框架中定义量子比特，我们实现了相干调控，同时保护量子比特免受噪声影响，证实了门操作期间的相干性保护。这些结果为实现抗噪空穴自旋量子比特提供了可行途径。
英文摘要
Hole spins in silicon quantum dots are a promising platform for quantum computing due to their strong intrinsic spin-orbit coupling (SOC), which enables fast, all-electrical control. However, this coupling also increases their susceptibility to charge noise, thereby limiting coherence times. Moreover, holes in silicon are also affected by hyperfine interactions with residual nuclear spins in the silicon substrate, introducing a non-negligible source of low-frequency noise. Here, we implement a phase-modulated concatenated continuous driving (CCD) technique for hole spin qubits to suppress low-frequency noise through microwave phase modulation. This approach stabilizes Rabi oscillations and extends the oscillation decay time compared to the conventional method. Furthermore, by defining a qubit in the CCD frame, we achieve coherent control while simultaneously protecting the qubit from noise, confirming coherence protection during gate operations. These results demonstrate a viable route toward noise-robust hole spin qubits.
