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Role of quantum correlation in metrology beyond standard quantum limit
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Quantum metrology is studied in the presence of quantum correlation. The quantum correlation measure based on quantum Fisher information enables us to gain a deeper insight on how quantum correlations are instrumental in setting metrological precision. Our analysis shows that not only the entanglement but also the quantum correlation plays important roles to enhance precision in quantum metrology. Even in the absence of entanglement, quantum correlation can be exploited as the resource to beat standard quantum limit and reach Heisenberg limit in metrology. Clearly unraveling the role of quantum correlations, the tighter bounds on the metrological precision are derived.
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Thermal Quantum Correlations in Coupled Andreev Spin Qubits: Interplay of Superconducting Phase and Spin-Orbit Interaction
Thermal LQFI and LQU in coupled Andreev spin qubits rise with tunneling and spin–orbit coupling, fall with temperature, and oscillate with superconducting phase via the effective exchange gap.
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