Enhanced Entanglement and Quantum Steering Induced by a Common Reservoir in Cavity Magnomechanics

Abstract This study proposes to enhance entanglement and control quantum steering via dissipative coupling in an open cavity magnomechanical system connected to a common reservoir shared by photon and magnon modes. In such a system, dissipative coupling induced by the common reservoir plays a crucial role in producing entanglements and quantum steering. The photon‐magnon‐phonon tripartite entanglement is significantly enhanced, exhibiting periodic sudden death and resurgence with the relative phase between coherent and dissipative couplings. It is revealed that the collaboration between dissipative and coherent couplings can produce entanglement and steering even in the absence of nonlinearity within the system. Moreover, the steering directivity can be controlled by adjusting the dissipative coupling strength and the relative phase. These findings are counterintuitive in terms of dissipation, which provides a novel approach for preparing quantum entanglement and manipulating quantum steering in an open system.