论文标题
声子引起的氮气空位中心的自旋去向钻石中的自旋时间从第一原理
Phonon Induced Spin Dephasing Time of Nitrogen Vacancy Centers in Diamond from First Principles
论文作者
论文摘要
具有较长时间的旋转量子位是开发新量子技术的必不可少的要求，并且具有许多潜在的应用，从量子信息处理到量子记忆和量子网络。在这里，我们报告了一项理论研究和钻石负电荷氮空位中心缺陷颜色中心的自旋脱位时间的计算。我们采用从头算密度的功能理论来计算电子结构，并使用累积扩展方法提取倾向时间。我们发现，与使用动态解耦技术的最新实验一致，声子引起的dephasing是T2在低温下的限制因素。该方法可以推广到半导体，分子系统和其他带盖材料中的其他自旋缺陷。
Spin qubits with long dephasing times are an essential requirement for the development of new quantum technologies and have many potential applications ranging from quantum information processing to quantum memories and quantum networking. Here we report a theoretical study and the calculation of the spin dephasing time of defect color centers for the negatively charged nitrogen vacancy center in diamond. We employ ab initio density functional theory to compute the electronic structure, and extract the dephasing time using a cumulant expansion approach. We find that phonon-induced dephasing is a limiting factor for T2 at low temperatures, in agreement with recent experiments that use dynamical decoupling techniques. This approach can be generalized to other spin defects in semiconductors, molecular systems, and other band gapped materials.
