Ultrastrong Magnon-Magnon Coupling Dominated by Antiresonant Interactions
arXiv:2008.10721 · doi:10.1038/s41467-021-23159-z
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.
arXiv comment36 pages, 4 figures
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- Distant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics
- Observation of the Magnonic Dicke Superradiant Phase Transition
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- Perfect Intrinsic Squeezing at the Superradiant Phase Transition Critical Point
- Exponentially Enhanced non-Hermitian Cooling
- Reconciling quantum and classical spectral theories of ultrastrong coupling: Role of cavity bath coupling and gauge corrections
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- Quantum Simulation of an Extended Dicke Model with a Magnetic Solid
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- Magneto-optical Spectroscopy with RAMBO: A Table-Top 30 T Magnet
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- Two-Polariton Blockade via Ultrastrong Light-Matter Coupling