利用电子辐照和热处理调控金刚石中NV色心浓度的研究

Nitrogen-vacancy (NV) in diamond is a very representative system in solid quantum information technology, due to its long spin coherence time and fast manipulation rates, straightforward optical initialization and read-out of the electronic spin state at room temperature. Based on NV centers for quantum gyroscope application, the high-density NV centers in diamond are needed. This project hope to research for the production of high-density NV centers in diamond from three aspects. (1) Research on the manipulation mechanism by electron irradiation, using different irradiation doses to optimize the concentration of NV centers; (2) Research on the manipulation mechanism by annealing, annealing experiment of diamond was carried out on difference the annealing temperature and annealing time to manipulate the concentration of NV centers; (3) Combing of theoretical study of the migration and evolution mechanism of NV centers in diamond to provide guidance for experiment. Through this project, we can understand the migration and evolution mechanism of NV centers in diamond and provide the optimal methods for the production high-density NV centers in diamond in the futher.

金刚石NV色心在室温下可以通过光学直接初始化和读取电子自旋态，且具有长的自旋相干时间和对操作的快速响应，使之成为固态量子信息技术的典型。基于金刚石NV色心量子陀螺的研究中，需要制备高密度的NV色心。本项目拟从三个方面研究金刚石NV色心浓度的优化方式：（1）电子辐照调控机制的研究，通过设置不同的辐照剂量来优化金刚石NV色心的浓度；（2）热处理调控机制的研究，通过设置不同的退火温度和退火时间退火处理金刚石样品，进一步调控金刚石中NV色心的浓度；（3）结合第一性原理计算研究金刚石NV色心的迁移、演化机制，为实验提供理论指导。通过本项目的研究，能够系统的理解金刚石中NV色心的迁移、演化机制，为进一步优化金刚石NV色心浓度提供依据。

金刚石中的NV色心作为固态量子比特被广泛研究，控制金刚石中NV色心的浓度是NV色心的重要研究之一。 本项目通过电子辐照、硅离子辐照、退火等实验方法控制金刚石中NV中心的浓度。 通过研究发现，大剂量电子辐照可以有效提高金刚石中NV中心的浓度，低于800℃退火处理也可以提高金刚石中NV中心的浓度，但是经过硅离子照射后，NV中心的浓度降低了 在钻石。 其次，本项目通过第一性原理计算了金刚石中空位和NV中心的正电子湮没寿命和动量谱，发现正电子湮没光谱技术可以灵敏地检测金刚石中的NV中心

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