Multimode quantum squeezed in natural non-Hermitian systems with dressing quantization

The quantum squeeze generated by energy level cascade four-wave mixing (ELC-FWM) in the PT symmetry and symmetry breaking coexistence region in an atomic system was studied by adjusting the ratio of the Rabi frequency of the dressing field to the dephasing rate of the energy level in this work. It was found that when the Rabi frequency of the dressing field dominates, the dressing field has the advantage of increasing the quantum squeeze while decreasing the nonlinear gain of the non-Hermitian system. Although the quantum squeeze is relatively weak, the dressing field has the advantage of improving the nonlinear gain characteristics when the dephasing rate of the energy level is dominant. This has the potential to be applied to the development of quantum metrology, quantum information processing and quantum memory devices.