Overcoming fundamental bounds on quantum conference key agreement
| Autor: | Carrara, Giacomo, Murta, Gláucia, Grasselli, Federico |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 19, 064017 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.19.064017 |
| Popis: | 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. Comment: 10 + 26 pages, 5 figures |
| Databáze: | arXiv |
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