  Quantum metrology with ultra-high precision usually requires atoms prepared
in an ultra-stable environment with well-defined quantum states. Thus, in
optical lattice clock systems deep lattice potentials are used to trap
ultra-cold atoms. However, decoherence, induced by Raman scattering and higher
order light shifts, can significantly be reduced if atomic clocks are realized
in shallow optical lattices. On the other hand, in such lattices, tunneling
among different sites can cause additional dephasing and strongly broadening of
the Rabi spectrum. Here, in our experiment, we periodically drive a shallow
$^{87}$Sr optical lattice clock. Counter intuitively, shaking the system can
deform the wide broad spectral line into a sharp peak with 5.4Hz line-width.
With careful comparison between the theory and experiment, we demonstrate that
the Rabi frequency and the Bloch bands can be tuned, simultaneously and
independently. Our work not only provides a different idea for quantum
metrology, such as building shallow optical lattice clock in outer space, but
also paves the way for quantum simulation of new phases of matter by
engineering exotic spin orbit couplings.
