4.7 Article

Experimental demonstrations of unconditional security in a purely classical regime

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SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41598-021-83724-w

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  1. GIST research institute (GRI) - GIST in 2021

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The USCKD protocol is a completely different approach to achieving unconditional security in the purely classical regime, utilizing classical channels and orthogonal bases to provide unconditional security through path superposition-based reversible unitary transformations.
So far, unconditional security in key distribution processes has been confined to quantum key distribution (QKD) protocols based on the no-cloning theorem of nonorthogonal bases. Recently, a completely different approach, the unconditionally secured classical key distribution (USCKD), has been proposed for unconditional security in the purely classical regime. Unlike QKD, both classical channels and orthogonal bases are key ingredients in USCKD, where unconditional security is provided by deterministic randomness via path superposition-based reversible unitary transformations in a coupled Mach-Zehnder interferometer. Here, the first experimental demonstration of the USCKD protocol is presented.

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