Photonic Chip Runs Grover’s Search With Four Qubits

Researchers at the University of Stuttgart have demonstrated measurement-based quantum computing on a silicon photonic chip, a significant step toward scalable quantum processors. The team generated entangled photonic states with up to four qubits and attained fidelities of 0.89 and 0.76 for four-photon star and linear graph states, respectively. These resource states enabled the implementation of both single- and two-qubit gates, as well as the successful execution of Grover’s search algorithm and the Deutsch, Jozsa algorithm. These results establish the feasibility of…