What is Guizhen 4-Photon 16-Qubit Photonic Chip?

Guizhen 4-Photon 16-Qubit Photonic Chip is an integrated photonic quantum processing chip that encodes sixteen qubits across four photons, using multiple degrees of freedom of each photon to represent quantum information rather than requiring one physical particle per qubit. It is designed to generate, manipulate, and measure entangled photonic states on a chip-scale platform, aiming to demonstrate compact quantum information processing using photons as qubit carriers.