  Understanding strongly interacting quantum matter and quantum gravity are
both important open issues in theoretical physics, and the holographic duality
between quantum field theory and gravity theory nicely brings these two topics
together. Nevertheless, direct connections between gravity physics and
experimental observations in quantum matter are still rare. Here we utilize the
gravity physics picture to understand quench dynamics experimentally observed
in a class of random spin models realized in several different quantum systems,
where the dynamics of magnetization are measured after the external
polarization field is suddenly turned off. Two universal features of the
magnetization dynamics, namely, a slow decay described by a stretched
exponential function and an oscillatory behavior, are respectively found in
different parameter regimes across different systems. This work addresses the
issues of generic conditions under which these two universal features can
occur, and we find that a natural answer to this question emerges in the
gravity picture. By the holographic duality bridged by a model proposed by
Maldacena and Qi, the quench dynamics after suddenly turning off the external
polarization field is mapped to disconnecting an eternal traversable wormhole.
Our studies show that insight from gravity physics can help unifying different
experiments in quantum systems.
