“…Using Algorithm 14 with an optimal non-SO [15,5,7] code, we construct a Reed-Muller [16,5,8] SO code with generator matrix 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 , whose dual code is a [16,11,4] code. Thus, by Corollary 23, we obtain an optimal [ [16,6,4]] quantum code by [6]. In the same manner, we obtain [ [11,3,3]] and [ [15,7,3]] quantum codes which are optimal by [6].…”