  We investigate a nucleation of a Euclidean wormhole and its analytic
continuation to Lorentzian signatures in Gauss-Bonnet-dilaton gravity, where
this model can be embedded by the type-II superstring theory. We show that
there exists a Euclidean wormhole solution in this model by choosing a suitable
shape of the dilaton potential. After the analytic continuation, this explains
a quantum creation of a time-like traversable wormhole. Finally, we discuss
relations to the information loss problem and the current literature.
