By engineering and manipulating quantum entanglement between incoming photons and experimental apparatus, we construct single-photon detectors which cannot distinguish between photons of very different wavelengths. These color erasure detectors enable a new kind of intensity interferometry, with potential applications in microscopy and astronomy. We demonstrate chromatic interferometry experimentally, observing robust interference using both coherent and incoherent photon sources.
@article{arxiv.1905.01823,
title = {Color Erasure Detectors Enable Chromatic Interferometry},
author = {Luo-Yuan Qu and Jordan Cotler and Fei Ma and Jian-Yu Guan and Ming-Yang Zheng and Xiuping Xie and Yu-Ao Chen and Qiang Zhang and Frank Wilczek and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1905.01823},
year = {2020}
}