Nonlinear Enhancement in Hybrid Optomagnonic Systems

Abstract

Photon blockade is a key quantum effect for generating single-photon sources essential to quantum information processing. Compared with unconventional photon blockade, the conventional counterpart provides higher single-photon generation efficiency but typically demands strong nonlinearity, which severely restricts experimental feasibility. Here, a nonlinear enhancement scheme based on a hybrid optomagnonic system is proposed. The central idea is to exploit an additional tripartite interaction among the TE mode, TM mode, and magnon that, under strong driving, induces two-mode squeezing. Via a squeezing transformation, the effective magnon–photon coupling is exponentially enhanced, giving rise to a strong effective Kerr nonlinearity and thus an increased energy-level detuning. Using both analytical calculations and numerical simulations of the second-order correlation function, it is shown that the conventional photon blockade is substantially enhanced. Compared with the pure optomagnonic scheme induced by the Faraday effect, the proposed approach reduces the second-order correlation function by more than an order of magnitude and dramatically broadens the blockade parameter window. Moreover, photon blockade is achieved even when the intrinsic coupling strength is much smaller than the cavity decay rate. These results suggest a feasible route toward high-efficiency conventional photon blockade without strong intrinsic nonlinearities, potentially facilitating on-chip single-photon sources for scalable quantum information processing.