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        "description": "The measurements cover a finite number of selected analyzer settings; orbital-angular-momentum correlations alone do not establish entanglement. Analyzer assumptions matter, and the work did not experimentally demonstrate an infinite-dimensional entangled state. The later author revision is another version of the same study.",
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      "statement": "# Coincidence measurements reveal entanglement in photon orbital-angular-momentum modes\n\nMair, Vaziri, Weihs and Zeilinger measured coincidences between pairs of photons whose spatial modes carry orbital angular momentum. Measurements in selected modes and superpositions supported entanglement in this spatial degree of freedom, extending the set of optical states available for quantum-information experiments.\n\n## Scientific scope\n\nThe measurements cover a finite number of selected analyzer settings; orbital-angular-momentum correlations alone do not establish entanglement. Analyzer assumptions matter, and the work did not experimentally demonstrate an infinite-dimensional entangled state. The later author revision is another version of the same study.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nAlois Mair; Alipasha Vaziri; Gregor Weihs; Anton Zeilinger\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Multi dimensional Photon Entanglement of Quantum States with Phase Singularities](https://arxiv.org/pdf/quant-ph/0104070v1)\n- [Mair et al. author-preprint v1 source archive and figures](https://arxiv.org/src/quant-ph/0104070v1)\n- [Entanglement of Orbital Angular Momentum States of Photons (author preprint v3)](https://arxiv.org/pdf/quant-ph/0104070v3)\n- [Entanglement of the orbital angular momentum states of photons](https://www.nature.com/articles/35085529)\n",
      "summary": "Mair, Vaziri, Weihs and Zeilinger measured coincidences between pairs of photons whose spatial modes carry orbital angular momentum. Measurements in selected modes and superpositions supported entanglement in this spatial degree of freedom, extending the set of optical states available for quantum-information experiments.",
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    "what_changed": "Mair, Vaziri, Weihs and Zeilinger measured coincidences between pairs of photons whose spatial modes carry orbital angular momentum. Measurements in selected modes and superpositions supported entanglement in this spatial degree of freedom, extending the set of optical states available for quantum-information experiments.",
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