  We show that simulated relativistic motion can generate entanglement between
artificial atoms and protect them from spontaneous emission. We consider a pair
of superconducting qubits coupled to a resonator mode, where the modulation of
the coupling strength can mimic the harmonic motion of the qubits at
relativistic speeds, generating acceleration radiation. We find the optimal
feasible conditions for generating a stationary entangled state between the
qubits when they are initially prepared in their ground state. Furthermore, we
analyze the effects of motion on the probability of spontaneous emission in the
standard scenarios of single-atom and two-atom superradiance, where one or two
excitations are initially present. Finally, we show that relativistic motion
induces sub-radiance and can generate a Zeno-like effect, preserving the
excitations from radiative decay.
