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An experimentally feasible scheme for preparing the squeezed spin states in a novel spin–mechanical hybrid system is studied. The setup under consideration is realized by a single‐crystal diamond waveguide with negatively charged silicon‐vacancy (SiV) centers embedded. After studying the strain couplings between the SiV spins and the propagating phonon modes, analyses show that long‐range spin–spin interactions can be achieved under large detuning condition. Modeled as an effective one‐axis twisting Hamiltonian, these nonlinear spin–spin couplings can steer the system to the squeezed spin states in the practical situations. This proposal may have interesting applications in high‐precision metrology and quantum information processing.

Preparing Squeezed Spin States in a Spin–Mechanical Hybrid System with Silicon‐Vacancy Centers