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Interferometers are widely used in imaging technologies to achieve enhancedspatial resolution, but require that the incoming photons be indistinguishable.In previous work, we built and analyzed color erasure detectors which expandthe scope of intensity interferometry to accommodate sources of differentcolors. Here we experimentally demonstrate how color erasure detectors canachieve improved spatial resolution in an imaging task, well beyond thediffraction limit. Utilizing two 10.9 mm-aperture telescopes and a 0.8 mbaseline, we measure the distance between a 1063.6 nm source and a 1064.4 nmsource separated by 4.2 mm at a distance of 1.43 km, which surpasses thediffraction limit of a single telescope by about 40 times. Moreover, chromaticintensity interferometry allows us to recover the phase of the Fouriertransform of the imaged objects - a quantity that is, in the presence of modestnoise, inaccessible to conventional intensity interferometry.

Improved Spatial Resolution Achieved by Chromatic Intensity Interferometry