High-efficiency entanglement of microwave fields in cavity opto-magnomechanical systems

TL;DR

This paper proposes a scheme to generate high-efficiency entangled microwave fields in a dual opto-magnomechanical system, demonstrating robust entanglement transfer from optical to microwave modes with potential quantum technology applications.

Contribution

It introduces a novel method to produce and transfer entanglement in microwave fields using magnons and optical cavities, achieving high efficiency and robustness.

Findings

Stationary entanglement E_{a_{1}a_{2}}=0.54 at r=1

Entanglement increases with squeezing parameter r

Entanglement survives up to 385 mK environmental temperature

Abstract

We demonstrate a scheme to realize high-efficiency entanglement of two microwave fields in a dual opto-magnomechanical system. The magnon mode simultaneously couples with the microwave cavity mode and phonon mode via magnetic dipole interaction and magnetostrictive interaction, respectively. Meanwhile, the phonon mode couples with the optical cavity mode via radiation pressure. Each magnon mode and optical cavity mode adopts a strong red detuning driving field to activate the beam splitter interaction. Therefore, the entangled state generated by the injected two-mode squeezed light in optical cavities can be eventually transferred into two microwave cavities. A stationary entanglement E_{a_{1}a_{2}}=0.54 is obtained when the input two-mode squeezed optical field has a squeezing parameter r=1. The entanglement E_{a_{1}a_{2}} increases as the squeezing parameter r increases, and it shows the flexible tunability of the system. Meanwhile, the entanglement survives up to an environmental temperature about 385 mK, which shows high robustness of the scheme. The proposed scheme provides a new mechanism to generate entangled microwave fields via magnons, which enables the degree of the prepared microwave entanglement to a more massive scale. Our result is useful for applications which require high entanglement of microwave fields like quantum radar, quantum navigation, quantum teleportation, quantum wireless fidelity (Wi-Fi) network, etc.