纠缠增强的射频场检测和波形感测
Entanglement-enhanced radio-frequency field detection and waveform sensing
摘要：
我们展示了一种新的技术，用于检测任意形状的射频波形的成分的基础上频闪反作用规避测量。我们结合量子非破坏测量和频闪探测，以检测超出标准量子极限的磁灵敏度的波形分量。使用$1.5\times 10^6$冷铷原子的系综，我们展示了纠缠增强的正弦和线性啁啾波形的传感，分别具有1.0（2）dB和0.8（3）dB的计量相关噪声降低。我们实现了$δ\rm{B}\sqrt{V}\approx 11.20~\rm{fT\sqrt{cm^3/Hz}}$的体积调整灵敏度，可与最好的RF~磁强计相媲美。
英文摘要：
We demonstrate a new technique for detecting components of arbitrarily-shaped radio-frequency waveforms based on stroboscopic back-action evading measurements. We combine quantum non-demolition measurements and stroboscopic probing to detect waveform components with magnetic sensitivity beyond the standard quantum limit. Using an ensemble of $1.5\times 10^6$ cold rubidium atoms, we demonstrate entanglement-enhanced sensing of sinusoidal and linearly chirped waveforms, with 1.0(2)dB and 0.8(3)dB metrologically relevant noise reduction, respectively. We achieve volume-adjusted sensitivity of $δ\rm{B}\sqrt{V}\approx 11.20~\rm{fT\sqrt{cm^3/Hz}}$, comparable to the best RF~magnetometers.
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