高斯测量在量子成像中的局限性
Limitations of Gaussian measurements in quantum imaging
AI总结:
本研究证明在量子成像中,当平均光子数或源尺寸趋于零时,非高斯测量在估计方差缩放上优于高斯测量,并给出示例验证。
摘要:
对热源成像自然会在接收端产生高斯态,这引发了一个问题:高斯测量能否在量子成像中实现最优性能。在本工作中,我们在每个时间模式的平均光子数ε→0或源尺寸L→0的极限下,建立了关于热源成像中高斯测量性能的不可行定理。我们证明,在估计方差随ε(或L)的缩放关系中,非高斯测量可以优于任何高斯测量。我们还提供了几个例子来说明这些不可行结果。
英文摘要:
Imaging thermal sources naturally yields Gaussian states at the receiver, raising the question of whether Gaussian measurements can perform optimally in quantum imaging. In this work, we establish no-go theorems on the performance of Gaussian measurements for imaging thermal sources in the limit of mean photon number per temporal mode $ε\to 0$ or source size $L \to 0$. We show that non-Gaussian measurements can outperform any Gaussian measurement in the scaling of the estimation variance with $ε$ (or $L$). We also present several examples to illustrate the no-go results.
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