435 citations · 1k across the 37 of their papers we have counts for
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Perfect Intrinsic Squeezing at the Superradiant Phase Transition Critical Point
Kenji Hayashida, Takuma Makihara, Nicolas Marquez Peraca +4
The ground state of the photon-matter coupled system described by the Dicke model is found to be perfectly squeezed at the quantum critical point of the superradiant phase transiti…
Ultrastrong Magnon-Magnon Coupling Dominated by Antiresonant Interactions
Takuma Makihara, Kenji Hayashida, G. Timothy Noe +13
Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics (QED) systems with ultrastrong light-matter interactions. Their ground states are predicted to be va…
Hamiltonian of a flux qubit-LC oscillator circuit in the deep-strong-coupling regime
Fumiki Yoshihara, Sahel Ashhab, Tomoko Fuse +2
We derive the Hamiltonian of a superconducting circuit that comprises a single-Josephson-junction flux qubit inductively coupled to an LC oscillator, and we compare the derived cir…
Magnonic Superradiant Phase Transition
Motoaki Bamba, Xinwei Li, Nicolas Marquez Peraca +1
We show that the low-temperature phase transition in ErFeO3 that occurs at a critical temperature of ~ 4 K can be described as a magnonic version of the superradiant phase transiti…
Nonclassicality of open circuit QED systems in the deep-strong coupling regime
Tomohiro Shitara, Motoaki Bamba, Fumiki Yoshihara +4
We investigate theoretically how the ground state of a qubit-resonator system in the deep-strong coupling (DSC) regime is affected by the coupling to an environment. We employ as a…