利用非高斯量子涨落增强磁灵敏度
Enhanced magnetic sensitivity with non-gaussian quantum fluctuations
摘要：
量子传感器的精度可以在其成分纠缠时超过经典传感器。在高斯压缩态中，量子关联导致量子投影噪声降低到低于散粒噪声极限。然而，最敏感的状态涉及复杂的非高斯量子波动，使得所需的测量协议具有挑战性。在这里，我们测量的灵敏度的非经典状态的电子自旋$J = 8$的镝原子，使用光诱导的非线性自旋耦合。磁子级分辨率使我们能够达到最佳的非高斯（过压缩）状态的灵敏度，远高于压缩状态的能力和大约一半的海森堡极限。
英文摘要：
The precision of a quantum sensor can overcome its classical counterpart when its constituents are entangled. In gaussian squeezed states, quantum correlations lead to a reduction of the quantum projection noise below the shot noise limit. However, the most sensitive states involve complex non-gaussian quantum fluctuations, making the required measurement protocol challenging. Here we measure the sensitivity of non-classical states of the electronic spin $J = 8$ of dysprosium atoms, created using light-induced non-linear spin coupling. Magnetic sublevel resolution enables us to reach the optimal sensitivity of non-gaussian (oversqueezed) states, well above the capability of squeezed states and about half the Heisenberg limit.
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