  Some of the most prominent theoretical predictions of modern times, e.g., the
Unruh effect, Hawking radiation, and gravity-assisted particle creation, are
supported by the fact that various quantum constructs like particle content and
vacuum fluctuations of a quantum field are observer-dependent. Despite being
fundamental in nature, these predictions have not yet been experimentally
verified because one needs extremely strong gravity (or acceleration) to bring
them within the existing experimental resolution. In this Letter, we
demonstrate that a post-Newtonian rotating atom inside a far-detuned cavity
experiences strongly modified quantum fluctuations in the inertial vacuum. As a
result, the emission rate of an excited atom gets enhanced significantly along
with a shift in the emission spectrum due to the change in the quantum
correlation under rotation. We propose an optomechanical setup that is capable
of realizing such acceleration-induced particle creation with current
technology. This provides a novel and potentially feasible experimental
proposal for the direct detection of noninertial quantum field theoretic
effects.
