Continuous-Variable Pairwise Entanglement Based on Optoelectromechanical System

Figure 2

Microwave pairwise entanglement versus normalized microwave detuning , as the MC pair number increases. Parameters: all MC resonant frequencies are identical,  = 9 GHz, and surrounding temperature T = 15 mK. The green short-dashed line shows the entanglement between two microwave modes with opposite detunings in a 2-pair system, the same is true for the orange dashed line with 5 pair MCs and the grey dot dash line with 10 pair MCs. The black line in the plot on the right shows the existence of entanglement between different MCs in the system with 10 pair MCs. “Positive” and “negative” correspond to the MCs whose effective detuning is with the same and opposite sign compared to , respectively.