I am using QETLAB, a package for working with quantum information theory in Matlab and I have some doubts. I am trying to calculate diamond norms using such for some quantum channels. However, when doing so, it is said that a superoperator must be the input to the function. I know the Kraus representation of the channels I am testing, so I am not sure how to get the superoperator form of such. In the example they put in their wiki for their diamond norm they use a function called ChoiMatrix that calculates the Choi matrix of a supeorperator, but I am not sure if inputing the Kraus operators there will give me what I need.
An insight about the usage of the functions would be helpful, so as the relationship between superoperators, Kraus operators and Choi matrices.