  In this paper, we study the Lorentzian AdS wormhole solutions constructed in
arXiv:0808.2481 [hep-th]. Each of them is a classical solution interpolating
between an AdS space and a flat space in type IIB supergravity. We calculate
the holographic entanglement entropy to probe this geometry. Our analysis shows
that there exits a mass gap in its holographic dual gauge theory and that the
entanglement between the two boundaries is rather suppressed than that we
naively expect for wormholes. We also examine the holographic conductivity on a
probe D-brane in this spacetime.
