Overcoming fundamental bounds on quantum conference key agreement

• URL: http://arxiv.org/abs/2211.15559v1
• Date: Mon, 28 Nov 2022 17:09:41 GMT
• Title: Overcoming fundamental bounds on quantum conference key agreement
• Authors: Giacomo Carrara, Gl\'aucia Murta and Federico Grasselli
• Abstract summary: Twin-Field Quantum Key Distribution (TF-QKD) enables two distant parties to establish a shared secret key. TF-QKD is the only scheme capable of beating the repeaterless bound on the bipartite private capacity. We propose a practical conference key agreement protocol that only uses WCPs and linear optics and prove its security with a multiparty decoy-state method.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Twin-Field Quantum Key Distribution (TF-QKD) enables two distant parties to establish a shared secret key, by interfering weak coherent pulses (WCPs) in an intermediate measuring station. This allows TF-QKD to reach greater distances than traditional QKD schemes and makes it the only scheme capable of beating the repeaterless bound on the bipartite private capacity. Here, we generalize TF-QKD to the multipartite scenario. Specifically, we propose a practical conference key agreement (CKA) protocol that only uses WCPs and linear optics and prove its security with a multiparty decoy-state method. Our protocol allows an arbitrary number of parties to establish a secret conference key by single-photon interference, enabling it to overcome recent bounds on the rate at which conference keys can be established in quantum networks without a repeater.

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