Establishing shared secret keys on quantum line networks: protocol and security. (arXiv:2304.01881v1 [quant-ph])

We show the security of multi-user key establishment on a single line of
quantum communication. More precisely, we consider a quantum communication
architecture where the qubit generation and measurement happen at the two ends
of the line, whilst intermediate parties are limited to single-qubit unitary
transforms. This network topology has been previously introduced to implement
quantum-assisted secret-sharing protocols for classical data, as well as the
key establishment, and secure computing. This architecture has numerous
advantages. The intermediate nodes are only …

architecture communication computing data hardware key keys measurement network networks nodes precisely protocol protocols quantum qubit secret secret keys secure computing security sharing single the key