  A nonuniformly accelerated quantum field in a cavity undergoes the coordinate
transformation of annihilation and creation operators, known as the Bogoliubov
transformation. This study considers the entropy production of a quantum field
in a cavity induced by the Bogoliubov transformation. By classifying the modes
in the cavity into the system and environment, we obtain the lower bound of the
entropy production, defined as the sum of the von Neumann entropy in the system
and the heat dissipated to the environment. This lower bound represents the
refined second law of thermodynamics for a quantum field in a cavity and can be
interpreted as the Landauer principle, which yields the thermodynamic cost of
changing information contained within the system. Moreover, it provides an
upper bound for the quantum mutual information to quantify the extent of the
information scrambling in the cavity due to acceleration.
