Strong-field interactions between a nanomagnet and a photonic cavity

TL;DR

This paper theoretically demonstrates that a nanomagnet coupled to a photonic cavity can achieve extremely strong quantum-coherent interactions, leading to entangled states and large oscillations with long coherence times.

Contribution

It provides a fully quantum-mechanical analysis predicting THz-level coupling and novel entangled states in a nanomagnet-cavity system, advancing quantum magnet-photon interaction understanding.

Findings

Coupling exceeding several THz predicted in specific cavity and nanomagnet configurations.

Eigenstates are highly entangled states of spin and photon number.

System exhibits large oscillations and long dephasing times in dynamics.

Abstract

We analyze the interaction of a nanomagnet with a single photonic mode of a microcavity in a fully quantum-mechanical treatment and find that exceptionally large quantum-coherent magnet-photon coupling can be achieved. Coupling terms in excess of several THz are predicted to be achievable in a spherical cavity of ~1 mm radius with a nanomagnet of ~100 nm radius and ferromagnetic resonance frequency of ~200 GHz. Eigenstates of the magnet-photon system correspond to entangled states of spin orientation and photon number, in which over 10^5 values of each quantum number are represented; conversely initial (coherent) states of definite spin and photon number evolve dynamically to produce large oscillations in the microwave power (and nanomagnet spin orientation), and are characterized by exceptionally long dephasing times.