Abstract

Antiferromagnetic (AFM) systems play a crucial role in AFM spintronics and quantum magnonics due to the natural entanglement of spins via AFM exchange coupling. Motivated by this property, this talk will explore magnon-magnon entanglement in AFMs under different scenarios, including both closed and open systems.

For closed systems, we examined various types of spin interactions and lattice effects, analyzed measures of entanglement [Physical Review B 102 (22), 224418 (2020)], and proposed an experimental setup involving an optical cavity-magnet system to detect this entanglement, featuring a magnon-phonon hybrid platform [Physical Review B 104 (22), 224302 (2021)]. Additionally, will briefly introduce our recent work on magnon modes in a magnon-photon-transmon hybridized AFM system [Physical Review B 108 (9), 094430 (2023)]. For open systems, we discovered that magnon-magnon entanglement can be maintained up to room temperature through magnon-phonon coupling, overcoming the challenges of nonlinear magnon-phonon interactions by extending the fluctuation-dissipation theory to magnonic systems [New Journal of Physics 25 (11), 113032 (2023)].

In the final part of the talk, I will discuss the ongoing exploration of magnon excitations in non-collinear magnetic textures—an evolving idea that I believe is worthy of further discussion.