Distribution of genuine high-dimensional entanglement over 10.2 km of noisy metropolitan atmosphere

• Authors: BULLA Lukas; HJORTH Kristian; KOHOUT Oskar; LANG Jan; ECKER Sebastian; NEUMANN Sebastian; BITTERMANN Julius; KINDLER Robert; HUBER Marcus; BOHMANN Martin; URSIN Rupert; PIVOLUSKA Matej
• Year of publication: 2023
• Type: Article in Periodical
• Magazine / Source: PHYSICAL REVIEW A
• MU Faculty or unit: Institute of Computer Science
• Web: https://doi.org/10.1103/PhysRevA.107.L050402
• Doi: http://dx.doi.org/10.1103/PhysRevA.107.L050402
• Keywords: non-locality; entanglement; high-dimensional quantum states
• Description: Our study investigates the presence of high-dimensional entanglement in a recent demonstration of a noise-resistant quantum key distribution (QKD) protocol presented in [Phys. Rev. X 13, 021001 (2023)]. We determined that it is possible to certify the dimensionality of the distributed entangled states to be at least three. To demonstrate this, we developed an energy-time entanglement discretization technique, as well as an improved witness for entanglement dimensionality. Our results provide insight into the complex relationship between high-dimensional entanglement and the noise resistance of QKD protocols operating in high dimensions.

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