  We propose a state preparation protocol based on sequential measurements of a
central spin coupled with a spin ensemble, and investigate the usefulness of
the generated multi-spin states for quantum enhanced metrology. Our protocol is
shown to generate highly entangled spin states, devoid of the necessity for
non-linear spin interactions. The metrological sensitivity of the resulting
state surpasses the standard quantum limit, reaching the Heisenberg limit under
symmetric coupling strength conditions. We also explore asymmetric coupling
strengths, identifying specific preparation windows in time for optimal
sensitivity. Our findings introduce a novel method for generating large-scale,
non-classical, entangled states, enhancing quantum-enhanced metrology within
current experimental capabilities.
