期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 51, 页码 21517-21520出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0908329106
关键词
continuous variables; quantum information; non-Gaussian states; transverse spatial modes
资金
- Brazilian agencies Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
- Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro
- National Institute for Science and Technology-Quantum Information
Most of the attention given to continuous variable systems for quantum information processing has traditionally been focused on Gaussian states. However, non-Gaussianity is an essential requirement for universal quantum computation and entanglement distillation, and can improve the efficiency of other quantum information tasks. Here we report the experimental observation of genuine non-Gaussian entanglement using spatially entangled photon pairs. The quantum correlations are invisible to all second-order tests, which identify only Gaussian entanglement, and are revealed only under application of a higher-order entanglement criterion. Thus, the photons exhibit a variety of entanglement that cannot be reproduced by Gaussian states.
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