2011/04/30 by Adetunmise C. Dada, Jonathan Leach, Gerald S. Buller +2 · 705 citations
Computer Science · Physics and Astronomy · #Bell state #Bell test experiments #Bell's theorem #Photon #Photon entanglement #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Quantum network #Quantum teleportation #Spontaneous parametric down-conversion #Statistical physics #physics.optics #quant-ph
paper · pdf · doi:10.1038/nphys1996
published in Nature Physics 7(9), 677-680 (Nature Portfolio)
openalex publication_date 2011/05/08 · arxiv created 2011/12/19 · arxiv updated 2016/01/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Quantum entanglement plays a vital role in many quantum information and communication tasks. Entangled states of higher dimensional systems are of great interest due to the extended possibilities they provide. For example, they allow the realisation of new types of quantum information schemes that can offer higher information-density coding and greater resilience to errors than can be achieved with entangled two-dimensional systems. Closing the detection loophole in Bell test experiments is also more experimentally feasible when higher dimensional entangled systems are used. We have measured previously untested correlations between two photons to experimentally demonstrate high-dimensional entangled states. We obtain violations of Bell-type inequalities generalised to d-dimensional systems with up to d = 12. Furthermore, the violations are strong enough to indicate genuine 11-dimensional entanglement. Our experiments use photons entangled in orbital angular momentum (OAM), generated through spontaneous parametric down-conversion (SPDC), and manipulated using computer controlled holograms.