  We demonstrate that the Byzantine Agreement Problem (BAP) in its weaker
version with detectable broadcast, can be solved using continuous variables
Gaussian states with Gaussian operations. The protocol uses genuine tripartite
symmetric entanglement, but differs from protocols proposed for qutrits or
qubits. Contrary to the quantum key distribution (QKD) which is possible with
all Gaussian states, for the BAP entanglement is needed, but not all tripartite
entangled symmetric states can be used to solve the problem.
