Optics

High-Dimensional Entanglement

 

High-Dimensional Entanglement for Quantum Communication

Our team has explored the capabilities of high-dimensional quantum entanglement to revolutionize quantum communication and foundational physics. This research focuses on the experimental generation and manipulation of high-dimensional entangled states, with applications in quantum key distribution (QKD) and testing the limits of Bell inequalities.

Using orbital angular momentum (OAM) entangled photons, we demonstrated the first violations of Bell inequalities generalized to systems with up to 12 dimensions and verified genuine entanglement involving 11 dimensions. These results highlight the potential of high-dimensional quantum systems for increasing the density of information transmission and potentially improving resilience against noise.

Our theoretical contributions include simplified techniques for characterising and exploiting high-dimensional entanglement using Bell inequality violations in realistic scenarios. These advances not only push the boundaries of quantum theory but also provide practical routes to leveraging high-dimensional entanglement in quantum networks.

Current projects are focused on applying these principles to scalable quantum technologies and exploring novel applications of high-dimensional entanglement.

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Selected Publications

1. Dada, A.C., Leach, J., Buller, G.S., Padgett, M.J., & Andersson, E. Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities. Nature Physics, 7, 677–680 (2011).
2. Dada, A.C. & Andersson, E. On Bell inequality violations with high-dimensional systems. International Journal of Quantum Information, 9(07n08), 1807–1823 (2011).
3. Dada, A.C. Multiplexing scheme for simplified entanglement-based large-alphabet quantum key distribution. Physical Review A, 91, 052313 (2015).