Twin-Field Quantum Key Distribution (QKD) is a QKD protocol that uses single-photon interference to perform QKD over long distances. QKD protocols that encode information using high-dimensional quantum states can benefit from increased key rates and higher noise resilience. We define the essence of Twin-Field QKD and explore its generalization to higher dimensions. Further, we show that, ultimately, the Twin-Field protocol cannot be generalized to higher dimensions in accordance with our definition.
On High-Dimensional Twin-Field Quantum Key Distribution / Mueller, Ronny; Zahidy, Mujtaba; Oxenløwe, Leif Katsuo; Forchhammer, Søren; Bacco, Davide. - In: QUANTUM. - ISSN 2521-327X. - ELETTRONICO. - 9:(2025), pp. 1869.1-1869.22. [10.22331/q-2025-10-01-1869]
On High-Dimensional Twin-Field Quantum Key Distribution
Bacco, Davide
2025
Abstract
Twin-Field Quantum Key Distribution (QKD) is a QKD protocol that uses single-photon interference to perform QKD over long distances. QKD protocols that encode information using high-dimensional quantum states can benefit from increased key rates and higher noise resilience. We define the essence of Twin-Field QKD and explore its generalization to higher dimensions. Further, we show that, ultimately, the Twin-Field protocol cannot be generalized to higher dimensions in accordance with our definition.
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