Letter abstract


Nature Physics 3, 91 - 95 (2007)
doi:10.1038/nphys507

Subject Categories: Quantum physics | Atomic and molecular physics | Information theory and computation

Experimental entanglement of six photons in graph states

Chao-Yang Lu1, Xiao-Qi Zhou1, Otfried Gühne2, Wei-Bo Gao1, Jin Zhang1, Zhen-Sheng Yuan1, Alexander Goebel3, Tao Yang1 and Jian-Wei Pan1,3

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Graph states1, 2, 3—multipartite entangled states that can be represented by mathematical graphs—are important resources for quantum computation4, quantum error correction3, studies of multiparticle entanglement1 and fundamental tests of non-locality5, 6, 7 and decoherence8. Here, we demonstrate the experimental entanglement of six photons and engineering of multiqubit graph states9, 10, 11. We have created two important examples of graph states, a six-photon Greenberger–Horne–Zeilinger state5, the largest photonic Schrödinger cat so far, and a six-photon cluster state2, a state-of-the-art 'one-way quantum computer'4. With small modifications, our method allows us, in principle, to create various further graph states, and therefore could open the way to experimental tests of, for example, quantum algorithms4, 12 or loss- and fault-tolerant one-way quantum computation13, 14.

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  1. Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
  2. Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstras zlige 21A, A-6020 Innsbruck, Austria
  3. Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg, Germany

Correspondence to: Chao-Yang Lu1 e-mail: cylu@mail.ustc.edu.cn

Correspondence to: Jian-Wei Pan1,3 e-mail: jian-wei.pan@physi.uni-heidelberg.de

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