  Quantum effects can stabilize wormhole solutions in general relativity,
allowing information and matter to be transported between two connected
spacetimes. Here we study the revival dynamics of signals sent between two
weakly coupled quantum chaotic systems, represented as identical
Sachdev-Ye-Kitaev models, that realize holographically a traversable wormhole
in anti-de Sitter spacetime AdS$_2$ for large number $N$ of particles. In this
limit we find clear signatures of wormhole behavior: an excitation created in
one system is quickly scrambled under its unitary dynamics, and is reassembled
in the other system after a characteristic time consistent with holography
predictions. This leads to revival oscillations that at low but finite
temperature decay as a power-law in time. For small $N$ we also observe
revivals and show that they arise from a different, non-gravitational
mechanism.
