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Quantum parameter estimation process: 1. the initial state preparation; 2. the parametric process via dynamical evolution; 3. the measurement of quantum state; 4. the parameter estimation
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Quantum Fisher information as an important quantity in quantum metrology determines the upper bound of the measurement accuracy. It is shown that the quantum feature such as entanglement can improve quantum Fisher information in some cases. Here we study how quantum coherence affects the quantum Fisher information from a general point of view. We f...
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