金刚石 NV 色心拥有相干时间长、易于操控等优秀特性，是时下研究的热门。本 文受刘仁保教授等人的工作所启发，提出一种利用金刚石 NV 色心的纵向弛豫时间 实现测量磁场的新方法。

团簇关联展开法 (CCE 方法) 是一种处理量子多体问题的方法，本文首先重复了 前人的工作，利用 CCE 方法对 NV 色心的纵向弛豫过程进行数值模拟。进而通过拟 合得到不同磁场下的纵向弛豫时间。然后，提出了利用不同磁场下纵向弛豫时间的变 化测量磁场的方法。并计算了相关数据。

但是，这种磁场测量方法还有测量精度不够高的缺点，希望能在后续工作中解决。

NV center has excellent characteristics such as long coherence time and easy manipulation, which is a hot research topic nowadays. Inspired by the work of Professor Liu Renbao and others, this paper proposes a new method to measure the magnetic field using the longitudinal relaxation time of the diamond NV center.

Theclustercorrelationexpansionmethod(CCEmethod)isamethodtodealwith the quantum many-body problem. This article first repeats the previous work, using the CCE method to numerically simulate the longitudinal relaxation process of the NV color center. Then the longitudinal relaxation time under different magnetic fields can be obtained by fitting. Then, a method of measuring the magnetic field using the relationship between the longitudinal relaxation time and the magnetic field is proposed. And calculated the relevant data.

However, this magnetic field measurement method also has the disadvantage of insu?icientmeasurementaccuracy,whichishopedtoberesolvedinthefollow-upwork.