(color online) (a) Model of quantum boson sampling machine.^[188] (b) The circuit consists of five input and output modes (1 to 5), eight DCs (η₁ to η₈), and eleven PSs (φ₁ to φ₁₁).^[189] (c) Implementation of the 5 ×5 modes integrated photonics network in Ref. [190].