Hefei-based Guizhen Chip Technology, in collaboration with the University of Science and Technology of China's Ren Xifeng research group, has demonstrated on-chip generation of a 4-photon, 16-qubit Greenberger-Horne-Zeilinger (GHZ) state and a 4-qubit cluster state.
The experiment was conducted on a photonic integrated circuit, marking a step toward measurement-based quantum computing using optical systems.
The team implemented Grover's search algorithm on the generated states, achieving an average identification probability of 0.987.
GHZ states and cluster states are fundamental resources for measurement-based quantum computing, where computation proceeds by measuring entangled qubits rather than applying sequential gates.
Generating such highly entangled multi-qubit states on a single chip addresses a key scalability challenge for optical quantum computing approaches.
The demonstration combines multi-photon generation, on-chip interferometric control, and high-fidelity measurement in a single platform.
Researchers note that the 16-qubit GHZ state was encoded in the path and polarization degrees of freedom of four photons.
The work is presented as a milestone toward the long-term goal of million-qubit optical quantum computers, though significant engineering challenges remain for scaling beyond the current demonstration.
Guizhen Chip's On-Chip MBQC Breakthrough Opens a Real Path to Million-Qubit Optical Quantum Computing
This is an independent summary. The complete reporting, supporting context and any primary documents remain with Pandaily.