blockade (NUMB) in a hybrid system formed by two microwave cavities and one yttrium iron
garnet (YIG) sphere, where the pump and signal cavities interact nonlinearly with each other
and the signal cavity is coupled to the YIG sphere. It is found that the nonlinear coupling
occurs between the pump cavity and magnon modes due to the dispersive interactions
among three bosonic modes. Meanwhile, the Kerr nonlinearity is present in the pump cavity …