论文标题
纠缠增强同步差异比较
Entanglement-enhanced Synchronous differential comparison
论文作者
论文摘要
量子纠缠使量子投影噪声和光子射击噪声施加的标准量子限制超出了标准量子极限之外的精度测量和频率计量。在这里，我们提出在同步差分测量中采用纠缠原子，以增强空间转移检测的灵敏度。研究了两种工程方法纠缠原子。纠缠原子云中两个像素之间的同步比较导致敏感性增强因子在标准量子极限上为1.4。增加原子数几乎无法进一步提高灵敏度。相反，两个单独由纠缠原子组成的独立像素之间的同步比较使每个像素中的$ 10^{3} $纠缠的原子的强烈敏感性增强，相当于9.7，对应于平均时间，以减少大约$ 10^^{2} $。大原子数可能会进一步提高灵敏度。我们的工作铺平了通过\ emph {int intu}成像光谱谱图对引力红移的纠缠增强检测的道路。
The quantum entanglement enables the precision measurement and frequency metrology beyond the standard quantum limit that is imposed by the quantum projection noise and photon shot noise. Here we propose employing the entangled atoms in the synchronous differential measurement to enhance the sensitivity of the spatial-shift detection. Two ways of engineering the entangled atoms are studied. The synchronous comparison between two pixels within an entangled atomic cloud leads to a sensitivity enhancement factor of 1.4 over the standard quantum limit. Increasing the atom number hardly further improves the sensitivity. In contrast, the synchronous comparison between two independent pixels that are individually composed of entangled atoms allows for a strong sensitivity enhancement by a factor of, for example, 9.7 with $10^{3}$ entangled atoms in each pixel, corresponding to a reduction of the averaging time by a factor of about $10^{2}$. A large atom number may further elevate the sensitivity. Our work paves the way towards the entanglement-enhanced detection of the gravitational redshift by means of the \emph{in situ} imaging spectroscopy.
