Figure 4
From: Quantum Coherent Feedback Control for Generation System of Optical Entangled State
The measured amplitude-sum (a) and phase-difference (b) correlation variances noise powers of the output beams, where (1) is the normalized QNL; (2–5) is the correlation noise powers with T = 0.31, 0.50, 0.72 and 1.00, respectively. The measurement parameters of SA: RBW 10 kHz; VBW 100 Hz.
