Josephson photonics with a two-mode superconducting circuit

@article{Armour2015JosephsonPW,
  title={Josephson photonics with a two-mode superconducting circuit},
  author={Andrew D Armour and Bjorn Kubala and Joachim Ankerhold},
  journal={Physical Review B},
  year={2015},
  volume={91},
  pages={184508}
}
We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage-biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies, tunneling Cooper pairs excite photons in both modes simultaneously leading to far-from-equilibrium states. These states display highly nonclassical features including strong antibunching, violation of Cauchy-Schwartz inequalities, and number… 

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