Experimental Realization of a Four-Photon Seven-Qubit Graph State for   One-Way Quantum Computation
  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%. 
Sang Min Lee, Hee Su Park, Jaeyoon Cho, Yoonshik Kang, Jae Yong Lee,   Heonoh Kim, Dong-Hoon Lee, and Sang-Kyung Choi
quant-ph