  The intersection of two-dimensional superconductivity and topologically
nontrivial states hosts a wide range of quantum phenomena, including Majorana
fermions. Coexistence of topologically nontrivial states and superconductivity
in a single material, however, remains elusive. Here, we report on the
observation of two-dimensional superconductivity and weak anti-localization at
the TiOx/KTaO3(111) interfaces. A remnant, saturating resistance persists below
the transition temperature as superconducting puddles fail to reach phase
coherence. Signatures of weak anti-localization are observed below the
superconducting transition, suggesting the coexistence of superconductivity and
weak anti-localization. The superconducting interfaces show roughly one order
of magnitude larger weak anti-localization correction, compared to
non-superconducting interfaces, alluding to a relatively large coherence length
in these interfaces.
