Nonreciprocal photon blockade in a two-mode cavity with a second-order nonlinearity

  title={Nonreciprocal photon blockade in a two-mode cavity with a second-order nonlinearity},
  author={Kai Wang and Qin Wu and Yafei Yu and Zhi-Ming Zhang},
  journal={Physical Review A},
It is shown that the Fizeau drag can be used to cause nonreciprocity. We propose the use of a nanostructured toroid cavity made of $\chi^{(2)}$ nonlinear materials to achieve nonreciprocal photon blockade (PB) through the Fizeau drag. Under the weak driving condition, we discuss the origins of the PB based on the doubly resonant modes with good spatial overlap at the fundamental and second-harmonic frequencies. We also find that for the fundamental mode, the PB happens when we drive the system… 

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