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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.52: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Quantum Secret Sharing in Multipartite Microwave Networks — •Karolina Weber1,2, Wun Kwan Yam1,2, Simon Gandorfer1,2, Florian Fesquet1,2, Kedar E. Honasoge1,2, Maria-Teresa Handschuh1,2, Achim Marx1, Rudolf Gross1, 2, 3, and Kirill G. Fedorov1,2, 3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2School of Natural Sciences, Technische Universität München, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology, 80799 Munich, Germany
Quantum secret sharing (QSS) is a quantum cryptography scheme that provides an unconditionally secure way to exchange information in multipartite networks. Here, information about a secret quantum state is shared with n receivers, where the original secret state can be reconstructed if and only if a sufficient number of receivers collaborate. The remaining receivers do not acquire enough information for reconstruction, thereby protecting the secret state from losses, noise, or malicious conspiracies. We experimentally implement the QSS protocol with coherent states in a microwave network with n = 3 parties using continuous-variable entanglement and analyze the achieved reconstruction fidelities for different scenarios. We observe that the reconstruction fidelity with 2 collaborating parties exceeds the no-cloning limit, thus, proving the unconditional security of the QSS protocol. Finally, we consider an extension of this experiment towards sharing of qubit states and its applications to blind quantum computing.
Keywords: quantum information processing; quantum cryptography; secret sharing; quantum communication