Security of Two-Way Quantum Key Distribution

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Provided by: University of Cambridge
Topic: Security
Format: PDF
Quantum key distribution protocols typically make use of a one-way quantum channel to distribute a shared secret string to two distant users. However, protocols exploiting a two-way quantum channel have been proposed as an alternative route to the same goal, with the potential advantage of outperforming one-way protocols. Here, the authors provide a strategy to prove security for two-way quantum key distribution protocols against the most general quantum attack possible by an eavesdropper. They utilize an entropic uncertainty relation, and only a few assumptions need to be made about the devices used in the protocol.
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