Continuous Variable Solution for Byzantine Agreement

@inproceedings{Neigovzen2005ContinuousVS,
  title={Continuous Variable Solution for Byzantine Agreement},
  author={Rodion Neigovzen and Anna Sanpera},
  year={2005}
}
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… 

Quantum entanglement

All our former experience with application of quantum theory seems to say that what is predicted by quantum formalism must occur in the laboratory. But the essence of quantum formalism— entanglement,

Efficiency in Quantum Key Distribution Protocols with Entangled Gaussian States

TLDR
The efficiency of QKD protocols that use as a resource entangled gaussian states and gaussian operations only is analyzed and a figure of merit is proposed to quantify the number of classical correlated bits that can be used to distill a key from a sample of N entangled states.

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