Entanglement enhanced and one-way steering in PT -symmetric cavity magnomechanics

TL;DR

This paper demonstrates that PT-symmetry in cavity magnomechanical systems significantly enhances entanglement and enables one-way quantum steering, with potential applications in quantum information processing.

Contribution

It introduces a PT-symmetric cavity magnomechanical system and shows enhanced entanglement and one-way steering compared to conventional systems.

Findings

Entanglement is significantly enhanced with PT-symmetry.

One-way quantum steering is achievable in the unbroken-PT regime.

Steady-state solutions are more stable in gain-loss systems.

Abstract

We study creation of entanglement and quantum steering in a parity-time- (PT -) symmetric cavity magnomechanical system. There is magnetic dipole interaction between the cavity and photon-magnon, and there is also magnetostrictive interaction which is induced by the phononmagnon coupling in this system. By introducing blue-detuned driving microwave field to the system, the bipartite entanglement of the system with PT -symmetry is significantly enhanced versus the case in the conventional cavity magnomechanical systems (loss-loss systems). Moreover, the one-way quantum steering between magnon-phonon and photon-phonon modes can be obtained in the unbroken-PT -symmetric regime. The boundary of stability is demonstrated and this show that the steady-state solutions are more stable in the gain and loss systems. This work opens up a route to explore the characteristics of quantum entanglement and steering in magnomechanical systems, which might have potential applications in quantum state engineering and quantum information.