Experimental Realization of a Four-Photon Seven-Qubit Graph State for One-Way Quantum Computation

TL;DR

This paper reports the experimental creation of a seven-qubit photonic graph state by fusing path qubits, enabling demonstration of quantum algorithms with high success probability.

Contribution

It introduces a scalable method for generating large photonic graph states using path qubit fusion, advancing one-way quantum computation.

Findings

Successfully generated a seven-qubit graph state

Verified genuine seven-qubit entanglement

Executed the Deutsch-Jozsa algorithm with over 90% success

Abstract

We propose and demonstrate the scaling up of photonic graph state through path qubit fusion. Two path qubits from separate two-photon four-qubit states are fused to generate a two-dimensional seven-qubit graph state composed of polarization and path qubits. Genuine seven-qubit entanglement is verified by evaluating the witness operator. Six qubits from the graph state are used to execute the general two-qubit Deutsch-Jozsa algorithm with a success probability greater than 90%.