  Moving cavities promise to be a suitable system for relativistic quantum
information processing. It has been shown that an inertial and a uniformly
accelerated one-dimensional cavity can become entangled by letting an atom emit
an excitation while it passes through the cavities, but the acceleration
degrades the ability to generate entanglement. We show that in the
two-dimensional case the entanglement generated is affected not only by the
cavity's acceleration but also by its transverse dimension which plays the role
of an effective mass.
