用于金刚石中高保真度核自旋控制的混合动力学解耦与相干驱动
Hybrid dynamical decoupling and coherent driving for high-fidelity nuclear-spin control in diamond
AI总结：
针对金刚石中核自旋控制的局限，提出混合动力学解耦与射频控制方法，在高保真度下降低射频功率与门时长，扩大了量子存储器和处理器的可访问核自旋寄存器规模。
AI中文摘要：
金刚石中的氮-空位（NV）色心可提供室温下的电子-核自旋寄存器，用于量子传感和量子信息处理，周围的13C核自旋则作为长寿命量子存储器。然而，大尺寸核自旋寄存器的相干控制受限于有限的电子自旋相干性和光谱可寻址性。现有方法遵循两种互补策略：动力学解耦（DD）门利用滤波函数共振实现选择性条件演化，但仅允许离散旋转角；而动力学解耦射频（DDrf）控制可恢复连续可调性，代价是对超精细几何结构和射频功率有严格要求。在此，我们引入混合动力学解耦与射频（H-DDrf）控制，该方法保留DD诱导的条件演化，并采用几何相位匹配的射频驱动完成目标操作。此方法在保持高保真度控制的同时，降低了射频功率和门时长，从而扩大了基于室温NV的量子存储器和量子处理器可访问的13C核自旋寄存器规模。
英文摘要：
Nitrogen-vacancy (NV) centers in diamond provide room-temperature electron-nuclear spin registers for quantum sensing and quantum information processing, with surrounding 13C nuclear spins serving as long-lived quantum memories. However, coherent control of large nuclear-spin registers is limited by finite electron-spin coherence and spectral addressability. Existing approaches follow two complementary strategies: dynamical-decoupling (DD) gates exploit filter-function resonances to realize selective conditional evolution but permit only discrete rotation angles, whereas dynamical-decoupling radio-frequency (DDrf) control restores continuous tunability at the cost of stringent hyperfine-geometry and RF-power requirements. Here, we introduce hybrid dynamical-decoupling and radio-frequency (H-DDrf) control, which preserves the DD-induced conditional evolution and employs a geometrically phase-matched RF drive to complete the target operation. This approach reduces both RF power and gate duration while maintaining high-fidelity control, thereby expanding the accessible 13C nuclear-spin register for room-temperature NV-based quantum memories and quantum processors.
