Science Daily May 25, 2021
Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics systems with ultra-strong light-matter interactions. However, such predictions have not been realized because antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. An international team of researchers (USA – Rice University, Japan, Germany, China) reports an unusual, ultra-strongly coupled matter-matter system of magnons that is analytically described by a unique Hamiltonian in which the relative importance of resonant and antiresonant interactions can be easily tuned and the latter can be made vastly dominant. They found a regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceeds analogous frequency shifts from resonant interactions. They 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 exploring exotic quantum vacuum phenomena predicted in ultra-strongly coupled light-matter systems. The discovery has implications for quantum simulation and sensing…read more. Open Access TECHNICAL ARTICLE
Evidence for dominant vacuum Bloch-Siegert shifts. Credit: Nature Communications volume 12, Article number: 3115 (2021)Â