Photon–magnon bundle emission via enhanced photon–magnon–atom tripartite interaction

Multipartite coherent interactions among distinct quantum systems are essential for quantum information and simulation but typically suffer from weak coupling. Here, we propose a scheme to realize photon-magnon-atom tripartite interactions and enhance their coupling strength via quantum squeezing. By applying a parametric drive to the microwave cavity and incorporating magnon Kerr nonlinearity, we induce squeezing of both photons and magnons, which boosts the effective coupling. Remarkably, strongly correlated photon-magnon bundle emission can be realized even under weak driving and weak intrinsic coupling conditions, with both the statistical properties and emission rate tunable via the squeezing strength. This scheme may offer promising applications in quantum information processing and quantum sensing technologies.