Journal
NATURE COMMUNICATIONS
Volume 2, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms1556
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Funding
- National Natural Science Foundation of China [10874162, 11074242, 11104261, 60921091]
- National Basic Research Program of China [2011CB921200, 2011CBA00200]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [200729]
- Fundamental Research Funds for the Central Universities [WK2030020004, WK2030020007]
- Anhui Provincial Natural Science Foundation [11040606Q47]
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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.
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