Figure 1 | Scientific Reports

Figure 1

From: The Goldilocks principle of learning unitaries by interlacing fixed operators with programmable phase shifters on a photonic chip

Figure 1

Universal architecture scheme. The proposed architecture involving alternating layers of random unitary matrices F and diagonal phase shifts layers (PL) \(\{\phi _{n}^{(p)}\}\), with \(p=1,\ldots ,N+1\). The upper insets depict the modulus and argument of the potential candidates for the unitary matrix F, which have been selected as the DFT, DFrFT, and a random unitary matrix. The lower insets illustrate potential photonic implementations to perform the unitary matrix F.

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