Nothing
#' @export
CX <- function(...){
CX <- matrix(c(1,0,0,0, 0,1,0,0, 0,0,0,1, 0,0,1,0),nrow=4,ncol=4)
ket <- list(...)
if(length(ket) == 0){
CX
} else{
CX %*% ket[[1]]
}
}
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