论文标题
有效检测来自Dicke状态的单个自旋的不均匀磁场
Efficient detection of inhomogeneous magnetic fields from a single spin with Dicke states
论文作者
论文摘要
有效检测单个自旋是提高量子磁场传感器灵敏度的重要目标。最近的结果表明，特定类型的纠缠（例如Greenberger-Horne-Zeilinger（GHz）状态）可以用作改善单个自旋检测性能的资源。但是，在实验上很难实现GHz状态的可扩展产生。希望使用可以轻松生成的实用纠缠状态。在本文中，我们提出了具有dicke状态的单个自旋的有效检测。我们展示了通过全球控制准备和测量迪克国家的方法。此外，我们调查了由于不需要的耦合与环境引起的逐渐启动会影响我们的提案的绩效，并表明与Dicke态的单个旋转检测相比，与可分离状态的经典策略相比，具有显着优势。我们的结果对于实现纠缠增强的单个自旋检测很重要。
The efficient detection of a single spin is a significant goal of improving the sensitivity of quantum magnetic-field sensors. Recent results show that a specific type of entanglement such as Greenberger-Horne-Zeilinger (GHZ) states can be used as a resource to improve the performance of single spin detection. However, scalable generation of the GHZ states is experimentally difficult to realize. It is desirable to use a practical entangled state that can be easily generated. In this paper, we propose the efficient detection of a single spin with Dicke states. We show a way to prepare and measure Dicke states via a global control. Moreover, we investigate how dephasing due to unwanted coupling with the environment affects the performance of our proposal, and show that single spin detection with Dicke states with dephasing has a significant advantage over the classical strategy with separable states. Our results are important toward realizing entanglement enhanced single spin detection.
