  The unique electronic structure found at interfaces between materials can
allow unconventional quantum states to emerge. Here we observe
superconductivity in electron gases formed at interfaces between (111) oriented
KTaO$_3$ and insulating overlayers of either EuO or LaAlO$_3$. The
superconducting transition temperature, approaching 2.2 K, is about one order
of magnitude higher than that of the LaAlO$_3$/SrTiO$_3$ system. Strikingly,
similar electron gases at (001) KTaO$_3$ interfaces remain normal down to 25
mK. The critical field and current-voltage measurements indicate that the
superconductivity is two dimensional. Higher mobility EuO/KTaO$_3$ (111)
samples show a large in-plane anisotropy in transport properties at low
temperatures prior to onset of superconductivity, suggesting the emergence of a
stripe like phase where the superconductivity is nearly homogeneous in one
direction, but strongly modulated in the other.
