论文标题
带有钻石传感器的微波磁场的Picotesla磁力测定法
Picotesla magnetometry of microwave fields with diamond sensors
论文作者
论文摘要
从天文学到通信工程的广泛应用，开发强大的微波场传感器既从根本和实际上都很重要。 Diamond中的氮呈（NV）中心是实现此目的的有吸引力的候选者，因为它具有磁性灵敏度，稳定性和在环境条件下的兼容性。但是，现有的基于NV中心的磁力计在微波频带中具有有限的灵敏度。在这里，我们提出了一种连续的杂化检测方法，即使在没有自旋对照的情况下，也可以增强传感器对弱微波的响应。在实验上，我们通过同时使用$ n _ {\ text {nv}} \ sim 2.8 \ sim 2.8 \ times10^{13} $ nv Centers $ 4 $ 4 $ 4 $ 4 $ 4 $ 4的$ 4^$ 4^$ 4^$ 4^$ 4^$ 4^$ 4^$ 4^$ nv Centers的合奏$ 4^$ 4.此外，我们还达到了$ 1/t $缩放频率分辨率，直到测量时间$ t $ 10000 s。我们的方法去除了对照脉冲，因此将极大地有益于基于钻石的微波传感器的实际应用。
Developing robust microwave-field sensors is both fundamentally and practically important with a wide range of applications from astronomy to communication engineering. The Nitrogen-Vacancy (NV) center in diamond is an attractive candidate for such purpose because of its magnetometric sensitivity, stability and compatibility with ambient conditions. However, the existing NV center-based magnetometers have limited sensitivity in the microwave band. Here we present a continuous heterodyne detection method that can enhance the sensor's response to weak microwaves, even in the absence of spin controls. Experimentally, we achieve a sensitivity of 8.9 pT$\cdot$Hz$^{-1/2}$ for microwaves of 2.9 GHz by simultaneously using an ensemble of $n_{\text{NV}} \sim 2.8\times10^{13}$ NV centers within a sensor volume of $4\times10^{-2}$ mm$^3$. Besides, we also achieve $1/t$ scaling of frequency resolution up to measurement time $t$ of 10000 s. Our method removes the control pulses and thus will greatly benefit the practical application of diamond-based microwave sensors.
