Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, 4072 Brisbane, Australia.
Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom.
Phys Rev Lett. 2019 Oct 4;123(14):143604. doi: 10.1103/PhysRevLett.123.143604.
We implement a general imaging method by measuring the complex degree of coherence using linear optics and photon number resolving detectors. In the absence of collective or entanglement-assisted measurements, our method is optimal over a large range of practically relevant values of the complex degree of coherence. We measure the size and position of a small distant source of pseudothermal light, and show that our method outperforms the traditional imaging method by an order of magnitude in precision. Finally, we show that a lack of photon-number resolution in the detectors has only a modest detrimental effect on measurement precision and simulate imaging using the new and traditional methods with an array of detectors, showing that the new method improves both image clarity and contrast.
我们通过使用线性光学和光子数分辨探测器来测量复相干度，实现了一种通用的成像方法。在不存在集体或纠缠辅助测量的情况下，我们的方法在复相干度的实际相关值的大范围上是最优的。我们测量了小的远源伪热光的尺寸和位置，并表明我们的方法在精度上比传统的成像方法高出一个数量级。最后，我们表明探测器中缺少光子数分辨率仅对测量精度有适度的不利影响，并使用探测器阵列模拟了新的和传统的成像方法，表明新方法提高了图像的清晰度和对比度。
