  The strong and collective atom-light interactions in cavity-QED systems
perform manifold benefits in quantum-enhanced measurements. Here, we study the
time-reversal protocol that has been proposed to sense small displacements of
the light field, and report the sensitivity of the scheme that could be speeded
up to attain the Heisenberg limit (HL).We show the holonomic unitary
parametrization process of the scheme and one only need to choose appropriate
initial states to pursue the ultimate sensitivity. The scheme may pave an
experimentally feasible way to achieve Heisenberg-limited metrology with
nonclassical states.
