Metasurface-based Optical Logic Operators Driven by Diffractive Neural Networks.

In this paper, a novel optical logic operator based on the multifunctional metasurface driven by all-optical diffractive neural network is reported, which can perform four principal quantum logic operations (Pauli-X, Pauli-Y, Pauli-Z and Hadamard gates). The two ground states |0〉 and |1〉 are characterized by two orthogonal linear polarization states. The proposed spatial- and polarization-multiplexed all-optical diffractive neural network only contains a hidden layer physically mapped as a metasurface with simple and compact unit cells, which dramatically reduces the volume and computing resources required for the system. The designed optical quantum operator has been proven to achieve high fidelities for all four quantum logical gates, up to 99.96% numerically and 99.88% experimentally. Our solution would facilitate the construction of large-scale optical quantum computing systems and scalable optical quantum devices. This article is protected by copyright. All rights reserved.