npj Quantum Information, Published online: 14 November 2024; doi:10.1038/s41534-024-00911-z
Quantum networks connect and supply a large number of nodes with multi-party quantum resources for secure communication, networked quantum computing and distributed sensing.
As these networks grow in size, certification tools will be required to answer questions regarding their properties.
In this work, researchers have demonstrated a general method to guarantee that certain correlations cannot be generated in a given quantum network. They have applied quantum inflation methods to data obtained in quantum group encryption experiments, guaranteeing the impossibility of producing the observed results in networks with fewer optical elements.
These results pave the way for scalable methods of obtaining device-independent guarantees on the network structure underlying multipartite quantum protocols.
