Phase-switchable nonreciprocal entanglement via magnon squeezing in ring-cavity optomagnomechanics

Z. Imara; A. El Allati; A. Belfakir; K. El Anouz; I. P. Castillo

doi:10.1103/rcw1-3wh7

paper

Phase-switchable nonreciprocal entanglement via magnon squeezing in ring-cavity optomagnomechanics

arXiv:2607.09663 · doi:10.1103/rcw1-3wh7

Abstract

Cavity optomagnomechanics provides a versatile platform to explore macroscopic quantum correlations, particularly nonreciprocal entanglement. In this work, we propose a theoretical scheme to generate switchable bipartite and tripartite entanglement in an optomagnomechanical ring cavity by exploiting phase-controlled magnon squeezing. Indeed, two spatially separated ferrimagnetic YIG microbridges become entangled through their magnetostriction-mediated coupling to mechanical motion and a common cavity field via radiation-pressure interaction. The squeezing process introduces two phase-dependent contributions to the magnon response, namely an effective detuning shift $Δ_{θ_{j}}$ and a quadrature-damping contribution $κ_{θ_{j}}$ , both of which reverse sign upon a $π$ phase shift, providing an in situ control to switch the entanglement response. The nonreciprocal entanglement is defined operationally through the asymmetric entanglement response under the phase reversal $θ_{j} \to θ_{j} + π$ , quantified by normalized contrast ratios $C_{E}$ and $C_{R}$ , which measure the relative difference between the entanglement obtained at $θ_{j}$ and at the phase-reversed configuration $θ_{j} + π$ . The resulting phase-tuning method provides a flexible and robust route to achieve high-contrast bipartite and tripartite entanglement within stable parameter regions, establishing magnon squeezing as a practical quantum resource for switchable quantum correlations in hybrid platforms.

7 figures. Accepted for publication in Phys. Rev. A

Phase-switchable nonreciprocal entanglement via magnon squeezing in ring-cavity optomagnomechanics

Abstract

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