Quantum secret sharing in tripartite superconducting network

Quantum Physics [Submitted on 15 Apr 2026] Quantum secret sharing in tripartite superconducting network W. K. Yam, C. Wilkinson, S. Gandorfer, F. Fesquet, M. Handschuh, A. Marx, R. Gross, N. Korolkova, K. G. Fedorov Superconducting microwave quantum networks is a rapidly developing field, enabling distributed quantum computing and holding a promise for hybrid architectures in quantum internet. Quantum secret sharing (QSS) is one of the key protocols for multipartite quantum networks and can provide an unconditionally secure way to share quantum states among n players. Using microwave two-mode squeezed states as an entanglement resource, we experimentally implement a QSS protocol with n = 3, where a subset of at least k = 2 players must collaborate to faithfully reconstruct the original secret state. We demonstrate reconstructed-state fidelities that surpass the asymptotic no-cloning threshold of F_\textrm{nc} = 2/3 and identify a parameter regime that allows for unconditionally secure communication in the presence of an omnipotent dishonest player. Furthermore, we experimentally explore inherent connections between QSS and other important quantum information processing tasks, such as quantum dense coding and elementary quantum error correction of channel erasures. Finally, we discuss extensions of QSS and its relation to the concept of blind quantum computing. Comments: 12 pages, 5 figures, 1 table Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.13643 [quant-ph]   (or arXiv:2604.13643v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.13643 Focus to learn more Submission history From: Wun Kwan Yam [view email] [v1] Wed, 15 Apr 2026 09:11:39 UTC (3,701 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)