Magnon‐Squeezing‐Induced Effective Coupling Amplification for Ground‐State Cooling

ABSTRACT Ground‐state cooling of mechanical resonators in cavity magnomechanical (CMM) systems is critical for quantum technologies, but is fundamentally limited by intrinsically weak magnon–phonon coupling. Conventional strong‐driving‐based coupling amplification introduces excess quantum noise, while pioneering squeezing‐assisted CMM cooling schemes rely on strong driving, using squeezing to suppress heating noise, leaving the weak‐coupling bottleneck unaddressed. Here, we propose a scheme using magnon squeezing as the core mechanism to enhance effective magnon–phonon coupling via tuning squeezing strength and phase, eliminating the need for intrinsic coupling enhancement or excessively strong driving beyond the linearization regime. Theoretical analysis shows that a red‐detuned squeezed magnon mode markedly boosts the net cooling rate, enabling ground‐state cooling at higher bath temperatures, with performance further optimized by reducing magnon dissipation. This approach amplifies magnomechanical coupling while avoiding detrimental strong‐driving effects, providing a practical, low‐noise route to efficient quantum cooling in CMM systems.