8 papers
Genuine multipartite entanglement is not a precondition for secure conference key agreement
Giacomo Carrara, Hermann Kampermann, Dagmar Bruß +1
Entanglement plays a crucial role in the security of quantum key distribution. A secret key can only be obtained by two parties if there exists a corresponding entanglement-based d…
Entropy bounds for multiparty device-independent cryptography
Federico Grasselli, Gláucia Murta, Hermann Kampermann +1
Multiparty quantum cryptography based on distributed entanglement will find its natural application in the upcoming quantum networks. The security of many multipartite device-indep…
Quantum key distribution overcoming extreme noise: simultaneous subspace coding using high-dimensional entanglement
Mirdit Doda, Marcus Huber, Gláucia Murta +3
High-dimensional entanglement promises to increase the information capacity of photons and is now routinely generated exploiting spatio-temporal degrees of freedom of single photon…
Quantum Conference Key Agreement: A Review
Gláucia Murta, Federico Grasselli, Hermann Kampermann +1
Conference key agreement (CKA), or multipartite key distribution, is a cryptographic task where more than two parties wish to establish a common secret key. A composition of bipart…
Key rates for quantum key distribution protocols with asymmetric noise
Gláucia Murta, Filip Rozpędek, Jérémy Ribeiro +2
We consider the asymptotic key rates achieved in the simplest quantum key distribution protocols, namely the BB84 and the six-state protocols, when non-uniform noise is present in…
Verifiable Hybrid Secret Sharing With Few Qubits
Victoria Lipinska, Gláucia Murta, Jérémy Ribeiro +1
We consider the task of sharing a secret quantum state in a quantum network in a verifiable way. We propose a protocol that achieves this task, while reducing the number of require…