Nonreciprocal photon blockade in a two-mode cavity with a second-order nonlinearity
Kai Wang, Qin Wu, Ya‐Fei Yu, Zhi‐Ming Zhang · Physical Review A · 2019
It is shown that the Fizeau drag can cause nonreciprocity. We propose the use of a nanostructured ring cavity made of ${\ensuremath{\chi}}^{(2)}$ nonlinear materials to achieve a nonreciprocal photon blockade (PB) through the Fizeau drag. Under the weak driving condition, we discuss the PB phenomena for the fundamental mode and the second-harmonic mode. We find that for the fundamental mode the PB happens when we drive the system from one side but disappears when we drive the system from the other side. However, there is no such phenomenon for the second-harmonic mode. Remarkably, the PB phenomenon occurs with a reasonably small optical nonlinearity, thus bringing the system parameters closer to the reasonably achievable realm by the current technology.