  In this paper, we look for signatures of quantum revivals in two-dimensional
conformal field theories (2d CFTs) on a spatially compact manifold by using
operator entanglement. It is believed that thermalization does not occur on
spatially compact manifolds as the quantum state returns to its initial state
which is a phenomenon known as quantum revival. We find that in CFTs such as
the free fermion CFT, the operator mutual information exhibits quantum revival
in accordance with the relativistic propagation of quasiparticles while in
holographic CFTs, the operator mutual information does not exhibit this revival
and the quasiparticle picture breaks down. Furthermore, by computing the
tripartite operator mutual information, we find that the information scrambling
ability of holographic CFTs can be weakened by the finite size effect. We
propose a modification of an effective model known as the line tension picture
to explain the entanglement dynamics due to the strong scrambling effect and
find a close relationship between this model and the wormhole (Einstein-Rosen
Bridge) in the holographic bulk dual.
