N participants, (ii) to share keys in distinct layers of a network simultaneously with separable
orbital angular momentum states of light. … The protocols designed for distribution of keys in
a network usually employ multiparty entangled states whose generation is yet in its infancy [3].
This has directed us towards proposals of two semiquantum key distribution protocols that do
not employ entangled states. The first protocol employ a ququart whose security is contingent …