Ultrastrong Magnon-Magnon Coupling Dominated by Antiresonant Interactions

TL;DR

This paper demonstrates a magnonic system that exhibits ultrastrong coupling dominated by antiresonant interactions, enabling simulation of exotic quantum vacuum phenomena with significant quantum fluctuation suppression.

Contribution

It introduces a tunable magnon-magnon coupling system that surpasses resonant interactions with dominant antiresonant effects, advancing quantum simulation capabilities.

Findings

Vacuum Bloch-Siegert shifts exceed resonant frequency shifts.

Up to 5.9 dB quantum fluctuation suppression achieved.

System effectively simulates ultrastrong light-matter interactions.

Abstract

Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics (QED) systems with ultrastrong light-matter interactions. Their ground states are predicted to be vacuum squeezed states with suppressed quantum fluctuations. The source of such phenomena are antiresonant terms in the Hamiltonian, yet antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. We report an unusual coupled matter-matter system of magnons that can simulate a unique cavity QED Hamiltonian with coupling strengths that are easily tunable into the ultrastrong coupling regime and with dominant antiresonant terms. We found a novel regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceed analogous frequency shifts from resonant interactions. Further, we theoretically explored the system's ground state and calculated up to 5.9 dB of quantum fluctuation suppression. These observations demonstrate that magnonic systems provide an ideal platform for simulating exotic quantum vacuum phenomena predicted in ultrastrongly coupled light-matter systems.