论文标题
在有旋转杂质的情况下，钻石中量子寄存器的性能
Performance of quantum registers in diamond in the presence of spin impurities
论文作者
论文摘要
钻石中的氮空位中心与可寻址的核自旋相连，形成了未来量子技术的多功能构建块。虽然以前的活动专注于仅一次或极少量的旋转进行感测，但最近已成功实施了用于量子信息处理的多数寄存器。进一步的进步需要详细了解连续门操作的量子协议的性能，因此，不仅仅是建立的放松和剥离治疗方法。在这里，我们为在存在相互作用的杂质旋转的集合的情况下，为一个由NV和环境成分建造的小型旋转的小型旋转寄存器提供了这样的理论分析。在适应群集相关扩展的情况下，我们预测了在脉冲存在的情况下，GHz和贝尔盖特操作的连贯性能以及忠诚度。还考虑了由替代氮或$^{13} c $原子组成的体积密度和几何形状的影响。
The Nitrogen Vacancy Center in diamond coupled to addressable surrounding nuclear spins forms a versatile building block for future quantum technologies. While previous activities focused on sensing with only a single or very few spins in operation, recently multi-qubit registers have been successfully implemented for quantum information processing. Further progress requires a detailed understanding of the performance of quantum protocols for consecutive gate operations and thus, beyond established treatments for relaxation and dephasing. Here, we provide such a theoretical analysis for a small spin registers with up to four spins built out of NV and environmental constituents in presence of ensembles of interacting impurity spins. Adapting a cluster correlation expansion, we predict coherence properties as well as fidelities for GHZ- and Bell-gate operations also in presence of decoupling pulses. The influence of the volume density and the geometry of the spin-bath consisting of the substitutional nitrogen- or $^{13}C$ atoms are also taken into account.
