固态自旋系综中偶极驱动的各向异性量子投影噪声的直接观测
Direct Observation of Dipolar-Driven Anisotropic Quantum Projection Noise in a Solid-State Spin Ensemble
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中文总结 AI 辅助
本工作利用NV中心系综在中等磁场下的重复读出，直接观测到偶极相互作用将量子投影噪声转化为各向异性分布，为固态自旋压缩和纠缠增强传感铺平道路。
中文摘要 AI 辅助
金刚石中的氮-空位（NV）中心是一个重要的量子传感平台。将量子投影噪声极限下的读出与强偶极相互作用相结合，有望大幅提升灵敏度。然而，实验上进入这一区域一直是一个长期挑战。在本工作中，我们展示了强相互作用二维NV中心系综的量子投影噪声分辨读出。我们的方法利用NV固有的$^{15}$N核存储器在中等磁场（约0.3 T）下进行重复读出，将读出保真度提高了近一个数量级。这使我们能够直接分辨相干自旋态的量子投影噪声，并观察系综固有的偶极相互作用将该噪声剪切为各向异性分布。我们的结果为固态中自旋压缩和纠缠增强传感的直接测量打开了大门。
英文摘要
The nitrogen-vacancy (NV) center in diamond is a prominent quantum-sensing platform. Combining readout at the quantum projection noise limit with strong dipolar interactions promises substantial gains in sensitivity. However, experimentally accessing this regime has remained a longstanding challenge. In this work, we demonstrate quantum-projection-noise-resolved readout of a strongly-interacting, two-dimensional ensemble of NV centers. Our approach leverages repetitive readout via the NV's intrinsic $^{15}$N nuclear memory at a moderate magnetic field ($\sim 0.3$ T), improving the readout fidelities by nearly an order of magnitude. This enables us to directly resolve the quantum projection noise of a coherent spin state and to watch the ensemble's intrinsic dipolar interactions shear this noise into an anisotropic profile. Our results open the door to direct measurements of spin squeezing and entanglement-enhanced sensing in the solid state.
发表机构
- Massachusetts Institute of Technology（麻省理工学院）
- Harvard University（哈佛大学）
- University of California, Santa Barbara（加州大学圣塔芭芭拉分校）
- California Institute of Technology（加州理工学院）
- Boston University（波士顿大学）
机构由 AI 辅助整理，请以论文原文为准。
