Universal holonomic control of algebras of observables

Closed paths of observable algebras can enact logical gates. We show that algebras of fixed block structure have a unique unitarily invariant parallel transport, recovering Berry–Wilczek–Zee transport on bands. On positive-dimensional configuration spaces, the holonomy group is the special-unitary part of the normalizer: every inner logical gate and every equal-type sector permutation is attainable. Given a compatible gapped Hamiltonian and access to the required paths, inner logical gates can be implemented adiabatically by isospectral control of a band refinement.