Light of Two Atoms in Free Space: Bunching or Antibunching?

@article{Wolf2020LightOT,
  title={Light of Two Atoms in Free Space: Bunching or Antibunching?},
  author={Sebastian Wolf and Stefan Richter and Joachim von Zanthier and Ferdinand Schmidt-Kaler},
  journal={Physical review letters},
  year={2020},
  volume={124 6},
  pages={
          063603
        }
}
Photon statistics divides light sources into three different categories, characterized by bunched, antibunched, or uncorrelated photon arrival times. Single atoms, ions, molecules, or solid state emitters display antibunching of photons, while classical thermal sources exhibit photon bunching. Here we demonstrate a light source in free space, where the photon statistics depends on the direction of observation, undergoing a continuous crossover between photon bunching and antibunching. We employ… 
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