Coulomb Bound States of Strongly Interacting Photons.

@article{Maghrebi2015CoulombBS,
  title={Coulomb Bound States of Strongly Interacting Photons.},
  author={Mohammad F. Maghrebi and Michael J. Gullans and Przemyslaw Bienias and S. Choi and I. Martin and Ofer Firstenberg and Mikhail D. Lukin and Hans Peter B{\"u}chler and Alexey V. Gorshkov},
  journal={Physical review letters},
  year={2015},
  volume={115 12},
  pages={
          123601
        }
}
We show that two photons coupled to Rydberg states via electromagnetically induced transparency can interact via an effective Coulomb potential. This interaction gives rise to a continuum of two-body bound states. Within the continuum, metastable bound states are distinguished in analogy with quasibound states tunneling through a potential barrier. We find multiple branches of metastable bound states whose energy spectrum is governed by the Coulomb potential, thus obtaining a photonic analogue… 

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