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Quantum metrology is studied in the presence of quantum correlation. Thequantum correlation measure based on quantum Fisher information enables us togain a deeper insight on how quantum correlations are instrumental in settingmetrological precision. Our analysis shows that not only the entanglement butalso the quantum correlation plays important roles to enhance precision inquantum metrology. Even in the absence of entanglement, quantum correlation canbe exploited as the resource to beat standard quantum limit and reachHeisenberg limit in metrology. Clearly unraveling the role of quantumcorrelations, the tighter bounds on the metrological precision are derived.

Role of quantum correlation in metrology beyond standard quantum limit