Optical quantum super-resolution imaging and hypothesis testing

Ugo Zanforlin, Cosmo Lupo, Peter Connolly, Pieter Kok, Gerald Stuart Buller, Zixin Huang

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
32 Downloads (Pure)


Estimating the angular separation between two incoherent thermal sources is a challenging task for direct imaging, especially at lengths within the diffraction limit. Moreover, detecting the presence of multiple sources of different brightness is an even more severe challenge. We experimentally demonstrate two tasks for super-resolution imaging based on hypothesis testing and quantum metrology techniques. We can significantly reduce the error probability for detecting a weak secondary source, even for small separations. We reduce the experimental complexity to a simple interferometer: we show (1) our set-up is optimal for the state discrimination task, and (2) if the two sources are equally bright, then this measurement can super-resolve their angular separation. Using a collection baseline of 5.3 mm, we resolve the angular separation of two sources placed 15 μm apart at a distance of 1.0 m with a 1.7% accuracy - an almost 3-orders-of-magnitude improvement over shot-noise limited direct imaging.

Original languageEnglish
Article number5373
JournalNature Communications
Publication statusPublished - 13 Sept 2022


  • Quantum information
  • Super-resolution imaging
  • Thermal state
  • Exoplanet detection
  • Quantum entropy
  • Hypothesis testing
  • Quantum imaging

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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