Coincidence measurements reveal entanglement in photon orbital-angular-momentum modes

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.

Scientific scope

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. 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.

Evidence

The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. 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.

Contributors

• The named authors in the research record · SCIENCE: These 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.

• Multi dimensional Photon Entanglement of Quantum States with Phase Singularities
• Mair et al. author-preprint v1 source archive and figures
• Entanglement of Orbital Angular Momentum States of Photons (author preprint v3)
• Entanglement of the orbital angular momentum states of photons

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