论文标题
用量子传感器的微波传感
Heterodyne Sensing of Microwaves with a Quantum Sensor
论文作者
论文摘要
钻石量子传感器对弱的微波磁场敏感与自旋跃迁共鸣。但是，此类协议中的光谱分辨率最终受传感器寿命的限制。在这里，我们演示了一种用于微波（MW）的杂差检测方法，导致GHz范围内的寿命独立光谱分辨率。我们通过从相干来源生成初始叠加态，将MW信号引用到局部振荡器。在实验上，我们达到了低于$ 1 \ \ rm {Hz} $的光谱分辨率，对于$ 4 \ \ rm {ghz} $信号远低于Kilohertz的传感器寿命限制。此外，我们通过在强大的纵向射频驱动器下应用敷料场，脉冲Mollow吸收和浮力动力学来控制MW场与两级系统的相互作用。脉冲Mollow吸收会导致最高灵敏度，而FLOQUET动力学允许独立于系统共振频率进行稳健的控制。我们的工作对于未来的研究以高频谱分辨率的宽频率范围内的微波信号进行研究很重要。
Diamond quantum sensors are sensitive to weak microwave magnetic fields resonant to the spin transitions. However the spectral resolution in such protocols is limited ultimately by sensor lifetime. Here we demonstrate a heterodyne detection method for microwaves (MW) leading to a lifetime independent spectral resolution in the GHz range. We reference the MW-signal to a local oscillator by generating the initial superposition state from a coherent source. Experimentally we achieve a spectral resolution below $1\ \rm{Hz}$ for a $4\ \rm{GHz}$ signal far below the sensor lifetime limit of kilohertz. Furthermore we show control over the interaction of the MW-field with the two level system by applying dressing fields, pulsed Mollow absorption and Floquet dynamics under strong longitudinal radio frequency drive. While pulsed Mollow absorption leads to highest sensitivity, the Floquet dynamics allows robust control independent from the systems resonance frequency. Our work is important for future studies in sensing weak microwave signals in wide frequency range with high spectral resolution.
