2025/03/09 by Wang, Yunkai, Zhou, Sisi · 3 citations
#FOS: Physical sciences #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2503.06363
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→ 0 or source size L → 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.