Magnon squeezing near a quantum critical point in a cavity-magnon-qubit system
Phys. Rev. A 113, 033707 – Published 6 March, 2026
DOI: https://doi.org/10.1103/d2st-rr91
Abstract
Preparing magnon nonclassical states is a central topic in the study of quantum magnonics. Here we propose to generate magnon squeezed states in a hybrid cavity-magnon-qubit system by engineering an effective Rabi-type magnon-qubit interaction. This is achieved by adiabatically eliminating the cavity mode and driving the qubit with two microwave fields, of which the driving frequencies and amplitudes are properly selected. In the normal phase of the effective Rabi model associated with the ground-state superradiant phase transition, the driven magnon-qubit dynamics generates a parametric-amplification-like two-magnon interaction that produces magnon squeezing. The resulting squeezing is strongly enhanced when the system is tuned close to the critical point. We further analyze the effects of the dissipation, dephasing, and thermal noise on the magnon squeezing. Our results indicate that a moderate degree of squeezing can be produced using currently available parameters in the experiments.
