Extended mutually unbiased bases to arbitrary-rank measurements with new structural relations. Proved incompatibility robustness equals λ₃,ₙ/3 for all 3-UMs. Hadamard-Clifford construction yields first non-binary examples.

Extended mutually unbiased bases to arbitrary-rank measurements with new structural relations. Proved incompatibility robustness equals λ₃,ₙ/3 for all 3-UMs. Hadamard-Clifford construction yields first non-binary examples.