Enhancing the quantum entanglement and EPR steering of a coupled optomechanical system with a squeezed vacuum field
Shao-xiong Wu, Cheng‐Hua Bai, Gang Li, Chang‐shui Yu, Tiancai Zhang
Abstract
Quantum entanglement and Einstein–Podolsky–Rosen (EPR) steering are valuable resources in quantum information processing. How to enhance the quantum entanglement and EPR steering of coupled optomechanical systems with a weak squeezed vacuum field is studied when the displacement of detuning induced by the mechanical mode is considered. Compared with the condition that the system interacts with a vacuum environment, the quantum entanglement and EPR steering are stronger when the squeezed vacuum field is applied. A squeezed vacuum field with a large degree is not beneficial to enhance the quantum entanglement and EPR steering. Rather than the squeezing parameter of the squeezed vacuum field, the reference phase plays a vital role in this model.