Gain Saturation Modified Quantum Noise Effect on Preparing a Continuous-Variable Entanglement

We examine the gain saturation effect in non-Hermitian systems of coupled gain–loss waveguides and whispering-gallery-mode microresonators, through which a continuous-variable (CV) entanglement light fields is generated. Here, we consider squeezed vacuum inputs for waveguide setup coherent drive study influence from used optical gain. Unlike ideal situation without saturation, it possible to generate stabilized measured by logarithmic negativity under saturation. Both types setups realize steady CV entanglement, provided that sufficiently quick. Particularly, with microresonators are pumped drive, created actually out noise squeezing characteristic, condition fast initial