Abstract
AbstractQuantum conference key agreement (CKA) extends the notion of quantum key distribution (QKD) to the multipartite scenario. We introduce CKA in Sect. 4.1 and present the multipartite generalization of the BB84 protocol, including insight on its security proof and asymptotic key rate. In Sect. 4.2 we describe the functioning of a general CKA protocol and define its security, which is proven in Sect. 4.4 of the Appendix. We conclude the Chapter by discussing the first experimental implementations of CKA (Sect. 4.3).
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