Joseph Ho

We report on an experimental demonstration of a recently proposed (n, n)-QSS (quantum secret sharing) protocol, which can be shown to be secure against participant attacks, using a four-photon GHZ state. Our work leverages the generation of high-quality and high-brightness non-linear single photon sources to achieve a secure key rate of 745 bits/sec in the asymptotic regime marking an important step toward scalable quantum-secure communication in networks.

Here we report on the experimental results implementing robust anonymous quantum conference key agreement using GHZ states. Results confirm the advantage when allowing for the use of multipartite entanglement along with bipartite entanglement.