Heisenberg-limited metrology from the quantum-quench dynamics of an anisotropic ferromagnet
This work investigates using a qubit-conditioned quantum quench of an anisotropic ferromagnet to achieve Heisenberg-limited parameter estimation by measuring only the qubit. The key finding is that this protocol yields information about the eigenmode frequency of the coupled system only when ground-state squeezing is present, demonstrating how genuine magnonic correlations enable super-resolution in parameter estimation.