论文标题
铁磁性玻璃纤维凝结物中的临界性增强量子传感：读数测量和检测噪声的作用
Criticality-enhanced quantum sensing in ferromagnetic Bose-Einstein condensates: role of readout measurement and detection noise
论文作者
论文摘要
从理论上讲，我们研究了二阶量子相变的铁磁参数中对照参数的估计。我们通过量子和经典的Fisher信息来量化灵敏度，并使用错误传播公式来量化灵敏度。对于这些不同的指标，我们发现与原子数附近的原子数相同，超出标准的量子 - 量子限制（SQL），而SQL从临界点缩小。我们发现，$ m_f = 0 $ zeeman子级别和横向磁化的耗竭都提供了足够质量的信号，以使灵敏度缩放量化。为了探索实验缺陷的效果，我们研究了在非零温度和非零检测噪声下围绕临界点的缩放。我们的结果表明，在具有当前的实验能力的铁磁凝结中，子-SQL感测的可行性。
We theoretically investigate estimation of the control parameter in a ferromagnetic Bose-Einstein condensate near second order quantum phase transitions. We quantify sensitivity by quantum and classical Fisher information and using the error-propagation formula. For these different metrics, we find the same, beyond-standard-quantum-limit (SQL) scaling with atom number near critical points, and SQL scaling away from critical points. We find that both depletion of the $m_f=0$ Zeeman sub-level and transverse magnetization provide signals of sufficient quality to saturate the sensitivity scaling. To explore the effect of experimental imperfections, we study the scaling around criticality at nonzero temperature and with nonzero detection noise. Our results suggest the feasibility of sub-SQL sensing in ferromagnetic condensates with current experimental capabilities.
