论文标题
通过混合动力学去耦序列，精确的高保真电子核自旋纠缠门在NV中心
Precise high-fidelity electron-nuclear spin entangling gates in NV centers via hybrid dynamical decoupling sequences
论文作者
论文摘要
固体中的颜色中心，例如Diamond的氮存剂中心，提供了良好的保护且控制良好的局部电子旋转，可用于各种量子技术。此外，周围跨核的长相干时间可以启用通过颜色中心控制的强大量子寄存器。我们设计了驱动电子自旋的脉冲序列方案，以生成与这些核记忆及的强大纠缠大门。我们发现，与单独使用Carr-Purcell-Meiboom-Gill（CPMG）相比，UHRIG解耦序列和由CPMG和Uhrig序列组成的混合方案可以从忠诚度，自旋控制范围和自旋选择性方面改善这些纠缠的门。我们为序列方案提供了分析表达式，并在数值上显示了我们方法对钻石中氮无效中心的功效。我们的结果广泛地适用于较弱的核中心，与少量的核自旋吨位相结合。
Color centers in solids, such as the nitrogen-vacancy center in diamond, offer well-protected and well-controlled localized electron spins that can be employed in various quantum technologies. Moreover, the long coherence time of the surrounding spinful nuclei can enable a robust quantum register controlled through the color center. We design pulse sequence protocols that drive the electron spin to generate robust entangling gates with these nuclear memory qubits. We find that compared to using Carr-Purcell-Meiboom-Gill (CPMG) alone, Uhrig decoupling sequence and hybrid protocols composed of CPMG and Uhrig sequences improve these entangling gates in terms of fidelity, spin control range, and spin selectivity. We provide analytical expressions for the sequence protocols and also show numerically the efficacy of our method on nitrogen-vacancy centers in diamond. Our results are broadly applicable to color centers weakly coupled to a small number of nuclear spin qubits.
