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Frontiers in Optics

Fast and Simple One-Way High-Dimensional Quantum Key Distribution

Kfir Sulimany, Rom Dudkiewicz, S. É. Korenblit, H. S. Eisenberg, Yaron Bromberg, Michael Ben-Or

Published Jan 1, 2021• 3 citations
Publisher

Abstract

We propose and analyze a novel high-dimensional quantum key distribution protocol. We implement the protocol using a software update in a standard two-dimensional system and observe a twofold enhancement in the secure key rate.
DOI
10.1364/fio.2021.fw1e.3

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We propose a high-dimensional quantum key distribution (QKD) protocol that employs temporal correlations of entangled photons. The security of the protocol relies on measurements by Alice and Bob in one of two conjugate bases, implemented using dispersive optics. We show that this dispersion-based approach is secure against collective attacks. The protocol, which represents a QKD analog of pulse position modulation, is compatible with standard fiber telecommunications channels and wavelength division multiplexers. We describe several physical implementations to enhance the transmission rate and describe a heralded qudit source that is easy to implement and enables secret-key generation at >4>4>4 bits per character of distilled key across over 200 km of fiber.