Enhanced bipartite entanglement and Gaussian quantum steering of squeezed magnon modes

TL;DR

This paper proposes a theoretical scheme to generate and optimize strong entanglement and Gaussian quantum steering between two squeezed magnon modes in a double cavity system driven by a two-mode squeezed vacuum, with potential robustness against parameter mismatches.

Contribution

It introduces a novel scheme for entangling magnon modes using a double cavity system with optical parametric amplifiers and analyzes optimal conditions and robustness for entanglement and quantum steering.

Findings

Achieved strong magnon-magnon entanglement under optimal parameters.

Demonstrated scheme robustness against cavity-magnon coupling mismatches.

Explored entanglement transfer efficiency and Gaussian quantum steering.

Abstract

We theoretically investigate a scheme to entangle two squeezed magnon modes in a double cavitymagnon system, where both cavities are driven by a two-mode squeezed vacuum microwave field. Each cavity contains an optical parametric amplifier as well as a macroscopic yttrium iron garnet (YIG) sphere placed near the maximum bias magnetic fields such that this leads to the excitation of the relevant magnon mode and its coupling with the corresponding cavity mode. We have obtained optimal parameter regimes for achieving the strong magnon-magnon entanglement and also studied the effectiveness of this scheme towards the mismatch of both the cavity-magnon couplings and decay parameters. We have also explored the entanglement transfer efficiency including Gaussian quantum steering in our proposed system