Agnew, MLeach, JMcLaren, MRoux, FSBoyd, RW2012-05-162012-05-162011-12Agnew, M, Leach, J, McLaren, M, Roux, FS and Boyd, RW. 2011. Tomography of the quantum state of photons entangled in high dimensions. Physical Review A, vol. 84(6), 062101, DOI: 10.1103/PhysRevA.84.0621011050-2947http://link.aps.org/doi/10.1103/PhysRevA.84.062101http://pra.aps.org/abstract/PRA/v84/i6/e062101http://hdl.handle.net/10204/5860Copyright: 2011 American Physical Society.Systems entangled in high dimensions have recently been proposed as important tools for various quantum information protocols, such as multibit quantum key distribution and loophole-free tests of nonlocality. It is therefore important to have precise knowledge of the nature of such entangled quantum states. The authors tomographically reconstruct the quantum state of the two photons produced by parametric downconversion that are entangled in a d-dimensional orbital angular momentum basis. They determine exactly the density matrix of the entangled two-qudit state with d ranging from 2 to 8. The recording of higher-dimensional states is limited only by the number of data points required and therefore the length of time needed to complete the measurements. They find all the measured states to have fidelities and linear entropies that satisfy the criteria required for a violation of the appropriate high-dimensional Bell inequality. Their results therefore precisely characterize the nature of the entanglement, thus establishing the suitability of such states for applications in quantum information science.enQuantum information protocolsMultibit quantum key distributionEntangled quantum statesHigh-dimensional Bell inequalityPhotonsArticleAgnew, M., Leach, J., McLaren, M., Roux, F., & Boyd, R. (2011). Tomography of the quantum state of photons entangled in high dimensions. http://hdl.handle.net/10204/5860Agnew, M, J Leach, M McLaren, FS Roux, and RW Boyd "Tomography of the quantum state of photons entangled in high dimensions." (2011) http://hdl.handle.net/10204/5860Agnew M, Leach J, McLaren M, Roux F, Boyd R. Tomography of the quantum state of photons entangled in high dimensions. 2011; http://hdl.handle.net/10204/5860.TY - Article AU - Agnew, M AU - Leach, J AU - McLaren, M AU - Roux, FS AU - Boyd, RW AB - Systems entangled in high dimensions have recently been proposed as important tools for various quantum information protocols, such as multibit quantum key distribution and loophole-free tests of nonlocality. It is therefore important to have precise knowledge of the nature of such entangled quantum states. The authors tomographically reconstruct the quantum state of the two photons produced by parametric downconversion that are entangled in a d-dimensional orbital angular momentum basis. They determine exactly the density matrix of the entangled two-qudit state with d ranging from 2 to 8. The recording of higher-dimensional states is limited only by the number of data points required and therefore the length of time needed to complete the measurements. They find all the measured states to have fidelities and linear entropies that satisfy the criteria required for a violation of the appropriate high-dimensional Bell inequality. Their results therefore precisely characterize the nature of the entanglement, thus establishing the suitability of such states for applications in quantum information science. DA - 2011-12 DB - ResearchSpace DP - CSIR KW - Quantum information protocols KW - Multibit quantum key distribution KW - Entangled quantum states KW - High-dimensional Bell inequality KW - Photons LK - https://researchspace.csir.co.za PY - 2011 SM - 1050-2947 T1 - Tomography of the quantum state of photons entangled in high dimensions TI - Tomography of the quantum state of photons entangled in high dimensions UR - http://hdl.handle.net/10204/5860 ER -