quantum information theory; quantum cryptography; multiparticle entanglement; foundations of physics; quantum tomography; quantum mechanics; quantum key distribution
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In recent years, researchers have gained a good understanding of quantum cryptography involving two parties, for instance in the generation of a secret key between two parties with help of the exchange of quantum bits. Yet the study of quantum protocols for secure communication involving multiple parties, for instance the joint counting of online votes, is still in its infancy. It is the goal of this research project to make a significant step towards a comprehensive understanding of multipartite quantum cryptography. Just as the Internet, where a network of computers has replaced point-to-point communication, the future of secure quantum communication will involve multiple parties. This project is therefore expected to impact current experiments as well as our future communication infrastructure.