Experimental generation of an eight-photon Greenberger–Horne–Zeilinger state

Yun-Feng Huang, Bi-Heng Liu, Liang Peng, Yu-Hu Li, Li Li, Chuan-Feng Li () and Guang-Can Guo
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Yun-Feng Huang: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Bi-Heng Liu: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Liang Peng: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Yu-Hu Li: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Li Li: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Chuan-Feng Li: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.
Guang-Can Guo: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026,China.

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract Multi-partite entangled states are important for developing studies of quantum networking and quantum computation. To date, the largest number of particles that have been successfully manipulated is 14 trapped ions. Yet in quantum information science, photons have particular advantages over other systems. In particular, they are more easily transportable qubits and are more robust against decoherence. Thus far, the largest number of photons to have been successfully manipulated in an experiment is six. Here we demonstrate, for the first time, an eight-photon Greenberger–Horne–Zeilinger state with a measured fidelity of 0.59±0.02, which proved the presence of genuine eight-partite entanglement. This is achieved by improving the photon detection efficiency to 25% with a 300-mW pump laser. With this state, we also demonstrate an eight-party quantum communication complexity scenario. This eight-photon entangled-state source may be useful in one-way quantum computation, quantum networks and other quantum information processing tasks.

Date: 2011
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DOI: 10.1038/ncomms1556

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