Characterization of the pairwise correlations in different quantum networks consisting of four-wave mixers and beamsplitters

Qi Jian¹, Xin Jun¹, Wang Hai-Long^{1, †}, Jing Jie-Tai^{1, 2, ‡}

(color online) The region plot of Eqs. (21) and (23). The purple region (1, 2) is the region of and the cyan region ((1, 4), (2, 3)) is the region of and . Inset: .