Enhancing One-Way Steering and Non-Classical Correlations in Magnomechanics via Coherent Feedback

TL;DR

This paper proposes a theoretical scheme using coherent feedback to enhance quantum correlations, including entanglement and steering, in a cavity magnon-mechanical system, with potential applications in quantum information processing.

Contribution

It introduces a novel coherent feedback method to significantly boost quantum correlations and tripartite entanglement in magnon-based systems, surpassing previous approaches.

Findings

Quantum correlations can be enhanced by adjusting the beam splitter's reflective parameter.

Coherent feedback increases the resilience of quantum correlations to thermal noise.

The scheme achieves genuine tripartite entanglement among photon, magnon, and phonon modes.

Abstract

In this work, we propose a theoretical scheme to explore the enhancement of quantum correlation hierarchies in a cavity magnonmechanical system via the coherent feedback tool. We use Gaussian geometric discord to quantify quantum correlations between the two magnon modes, including those beyond entanglement, in the steady state. Logarithmic negativity and Gaussian quantum steering are employed to characterize entanglement and steerability, respectively. Our results show that adjusting the beam splitter's reflective parameter can significantly enhance quantum correlations and increase their resilience to thermal noise. Moreover, we demonstrate that coherent feedback can achieve enhanced genuine tripartite entanglement among the photon, magnon \(M_1\), and phonon. These findings present promising strategies for enhancing entanglement in magnon-based systems and advancing quantum information technologies. We conclude by validating the system and demonstrating its ability to detect entanglement.