  Realization of practical superconducting quantum computing requires many
qubits of long coherence time. Compared to the commonly used Ta deposited on
c-plane sapphire, which occasionally form {\alpha}-Ta (111) grains and
\b{eta}-tantalum grains, high quality Ta (110) film can grow epitaxial on
a-plane sapphire because of the atomic relationships at the interface.
Well-ordered {\alpha}-Ta (110) film on wafer-scale a-plane sapphire has been
prepared. The film exhibits high residual resistance ratio. Transmon qubits
fabricated using these film shows relaxation times exceeding 150 {\mu}s. The
results suggest Ta film on a-plane sapphire is a promising choice for long
coherence time qubit on wafer scale.
