Study On Anti-bunching Effect Of Magnon In Cavity Magnonic System

The development of quantum optics speeds up the application of quantum technology.Many non-classical properties in the quantum world provide a unique perspective for information processing.Different from classical information processing,quantum information processing has many unique advantages in information encoding,transmission,calculation and storage,which has become an inevitable trend in the future communication field and information computing field.Single magnon source shows great vitality in coherent information transmission and single magnon illumination,etc.The long coherence time,high frequency information exchange and large light-matter coupling strength of cavity magnonic system provide a new platform for the study of quantum optics.Compared with cavity optomechanics system,cavity magnonic system has better stability and is more conducive to the development of microelectronics devices and quantum components integration.It has more potential applications in the future quantum information age.Single quantum source plays an important role in quantum communication.How to achieve perfect single quantum source has always been the concern of many researchers.The single-quanta blockade must be achieved in order to generate a single-quanta source,the core idea of which is to block the excitation path between single excited state and double excited state through certain physical mechanism.Blocking mechanism mainly include the conventional blockade and unconventional blockade.The former is based on the level unharmonicity of the system.However,conventional blockade often require larger coupling strength to achieve greater energy level splitting.The latter mainly relies on the mutually canceling interference of the different excitation paths in the system to block.Compared with the conventional blocking mechanism,it is still applicable in the case of weak coupling.In this paper,we study the antibunching effect of magnon in cavity magnonic system.By taking advantage of the strong coupling and low dissipation of cavity magnonic system,conventional blocking mechanism and unconventional blocking mechanism can exist simultaneously under appropriate parameter conditions.The magnetostatic modes and the qubit are indirectly coupled through the superconducting microwave cavity.We apply a weak driving field on the qubit and the magnetic film respectively,and the coupling energy level between the system and the external driving field is adjusted by changing the frequency of the external driving field.We give the system Hamiltonian and obtain the optimal condition of magnon blocking according to the Schrodinger equation,and find the global optimal blocking region analytically.We describe the dynamic evolution of the system with the master equation,and numerically solve the equal-time secondorder correlation function of the magnon under the experimental parameters,which is consistent with the analytical optimal condition.The coexistence of conventional and unconventional blocking mechanisms at global blocking not only enhances the blocking effect but also increases the average single magnon number.