Strong coupling between coherent ferrons and cavity acoustic phonons

TL;DR

This paper theoretically predicts a strong and tunable hybridization between coherent ferrons and cavity acoustic phonons in a ferroelectric membrane, enabling new quantum control possibilities at room temperature.

Contribution

It introduces a novel hybridized ferron-phonon state with ultra-strong coupling and electric-field control, advancing hybrid quantum system research.

Findings

Ultra-strong ferron-phonon coupling (>10% of resonant frequency) at room temperature.

Electric-field-driven bistable control of hybridization via ferroelectric switching.

Potential to reach deep strong coupling regime near phase transition.

Abstract

Coherent ferrons, the quanta of polarization waves, can potentially be hybridized with many other quasiparticles for achieving novel control modalities in quantum communication, computing, and sensing. Here, we theoretically demonstrate a new hybridized state resulting from the strong coupling between fundamental-mode (wavenumber is zero) coherent ferrons and cavity bulk acoustic phonons. Using a van der Waals ferroelectric CuInP2S6 membrane as an example, we predict an ultra-strong ferron-phonon coupling at room temperature, where the coupling strength g_c reaches over 10% of the resonant frequency {\omega}_0. We also predict an in-situ electric-field-driven bistable control of mode-specific ferron-phonon hybridization via ferroelectric switching. We further show that, CuInP2S6 allows for reaching the fundamentally intriguing but challenging deep strong coupling regime (i.e., g_c/{\omega}_0>1) near the ferroelectric-to-paraelectric phase transition. Our findings establish the theoretical basis for exploiting coherent ferrons as a new contender for hybrid quantum system with strong and highly tunable coherent coupling.