Enhanced Entanglement and Controlling Quantum Steering in a Laguerre–Gaussian Cavity Optomechanical System with Two Rotating Mirrors

Abstract

Gaussian quantum steering is a type of quantum correlation in which two entangled states exhibit asymmetry. An efficient theoretical proposal is presented for the control of quantum steering and enhancement of entanglement in a Laguerre-Gaussian (LG) cavity optomechanical system. The system contains two rotating mirrors and a coherently driven optical parametric amplifier (OPA). The numerical results show significantly improved mirror-mirror and mirror-cavity entanglements by controlling the system parameters such as parametric gain, parametric phase, and the frequency of the two rotating mirrors. In addition to bipartite entanglement, our system also exhibits mirror-cavity-mirror tripartite entanglement as well. Another intriguing finding is the control of quantum steering, for which several results were obtained by investigating it for various system parameters. It is shown that the steering directivity is primarily determined by the frequency of two rotating mirrors. Furthermore, for two rotating mirrors, quantum steering is found to be asymmetric both one-way and two-way. Therefore, it can be asserted that the current proposal may help in the understanding of non-local correlations and entanglement verification tasks.

Controlling Remote Entanglement and One‐Way Steering Via a Squeezed Vacuum Field and an Optical Parametric Amplifier

“…[44] The investigation of simultaneous enhanced entanglement and EPR steering between subsystems is of great significant for the quantum communication and computing. [45][46][47] Many efforts have been made, such as the generation of mechanical squeezing and the enhancement of entanglement and EPR steering can be achieved by using the optical parametric amplifier (OPA), [48][49][50][51][52] and utilizing a squeezed vacuum field. [53,54] Furthermore, quantum correlations are easily disturbed by environmental thermal noise.…”

Distant entanglement via photon hopping in a coupled cavity magnomechanical system

“…Major advancements in nanotechnology already provided novel platform such as cavity optomechanical system to study macroscopic bipartite entanglement between a single cavity mode and a vibrating mirror 2 . Subsequently, several studies such as entanglement of two vibrating mirrors 4 – 8 , Entanglement of multiple cavity modes coupled to single vibrating mirror 9 – 11 , entanglement in Laguerre-Gaussian cavity system 12 – 18 explored macroscopic quantum entanglement in cavity optomechanical systems.…”