Improved Spatial Resolution Achieved by Chromatic Intensity Interferometry

Lu Chuan Liu, Luo Yuan Qu, Cheng Wu, Jordan Cotler, Fei Ma, Ming Yang Zheng, Xiu Ping Xie, Yu Ao Chen, Qiang Zhang, Frank Wilczek, Jian Wei Pan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Interferometers are widely used in imaging technologies to achieve enhanced spatial resolution, but require that the incoming photons be indistinguishable. In previous work, we built and analyzed color erasure detectors, which expand the scope of intensity interferometry to accommodate sources of different colors. Here we demonstrate experimentally how color erasure detectors can achieve improved spatial resolution in an imaging task, well beyond the diffraction limit. Utilizing two 10.9-mm-aperture telescopes and a 0.8 m baseline, we measure the distance between a 1063.6 and a 1064.4 nm source separated by 4.2 mm at a distance of 1.43 km, which surpasses the diffraction limit of a single telescope by about 40 times. Moreover, chromatic intensity interferometry allows us to recover the phase of the Fourier transform of the imaged objects - a quantity that is, in the presence of modest noise, inaccessible to conventional intensity interferometry.

Original languageEnglish (US)
Article number103601
JournalPhysical Review Letters
Issue number10
StatePublished - Sep 3 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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