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) FWM + FWM (BS)+FWM (BS) network. (a) FWM + FWM + FWM network. is coherent input signal. , , and are vacuum inputs. is the power gain of the cell. Cell and cell have the same power gains for simplicity. , , , and are the quadruple output beams. (b) FWM+BS+BS network. is coherent input signal. , , and are vacuum inputs. is the power gain of the cell. and have the same transmissions for simplicity. , , , and are the quadruple output beams.