Unconventional photon blockade induced by the self-Kerr and cross-Kerr nonlinearities

Abstract

We study the use of the self-Kerr and cross-Kerr nonlinearities to realize strong photon blockade in a weakly driven, four-mode optomechanical system. According to the Born−Oppenheimer approximation, we obtain the cavity self-Kerr coupling and the inter-cavity cross-Kerr coupling, adiabatically separated from the mechanical oscillator. Through minimizing the second-order correlation function, we find out the optimal parameter conditions for the unconventional photon blockade. Under the optimal conditions, the strong photon blockade can appear in the strong or weak nonlinearities.

Key words： unconventional photon blockade; cross-Kerr nonlinearity; self-Kerr nonlinearity; optomechanical system

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 12034007 and 12204310), the Shanghai Sailing Program (Grant No. 21YF1446900), and the Research start-up project of Shanghai Institute of Technology (Grant No. YJ2021-65).

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