  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.
