Experimental demonstration of graph-state quantum secret sharing

Abstract

Distributed quantum communication and quantum computing offer many new opportunities for quantum information processing. Here networks based on highly nonlocal quantum resources with complex entanglement structures have been proposed for distributing, sharing and processing quantum information. Graph states in particular have emerged as powerful resources for such tasks using measurement-based techniques. We report an experimental demonstration of graph-state quantum secret sharing, an important primitive for a quantum network. We use an all-optical setup to encode quantum information into photons representing a five-qubit graph state. We are able to reliably encode, distribute and share quantum information between four parties. In our experiment we demonstrate the integration of three distinct secret sharing protocols, which allow for security and protocol parameters not possible with any single protocol alone. Our results show that graph states are a promising approach for sophisticated multi-layered protocols in quantum networks.

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• Protocol using kicked Ising dynamics for generating states with maximal multipartite entanglement
• Differential Phase Shift Quantum Secret Sharing Using a Twin Field with Asymmetric Source Intensities
• Unitary $t$-designs from $relaxed$ seeds
• Experimental characterization of a non-local convertor for quantum photonic networks
• Implementation of single-qubit measurement-based t-designs using IBM processors
• Quantum Anonymity for Quantum Networks
• Optimal Verification of the Bell State and Greenberger-Horne-Zeilinger States in Untrusted Quantum Networks