Color Erasure Detectors Enable Chromatic Interferometry
Luo-Yuan Qu, Jordan S. Cotler, Fei Ma, Jian-Yu Guan, Ming-Yang Zheng, Xiu-Ping Xie, Yu-Ao Chen, Qiang Zhang, Frank A. Wilczek, Jian-Wei Pan · Physical Review Letters · 2019
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.