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AQUATIC ENTANGLER VS RESOURCES FISHER HOW TO
However, the question of how to quantify the quantum coherence has just been paid the attention recently (see, e.g., Baumgratz et al. Quantum coherence is one of the old but always important concepts in quantum mechanics, and now it has been regarded as a necessary resource for quantum information processing and quantum metrology.
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Quantifying quantum coherence with quantum Fisher information. In particular, the quantitative quantum correlations based on QFI coincide with the geometric discord for pure quantum states. , we show that the presence of quantum correlation can be confirmed by the difference of the Fisher information induced by the measurements of two hierarchies. By investigating the hierarchy of measurement-induced Fisher information introduced in Lu et al. We define two ways of quantifying the quantum correlations based on quantum Fisher information (QFI) in order to study the quantum correlations as a resource in quantum metrology. Kim, Sunho Li, Longsuo Kumar, Asutosh Wu, Junde We also introduce a general method to obtain the maximal Fisher information for a given state.« lessĬharacterizing nonclassical correlations via local quantum Fisher information The phenomenon that the quantum Fisher information,more » namely, the precision of estimation, changes dramatically can be used to detect the quantum criticality of the environment. Different initial states of the environment are considered. By choosing a fixed time or taking the time average, one can see the quantum Fisher information presents a sudden drop at the critical point. Fisher information decays with time almost monotonously when the environment reaches the critical point. We employ Ising spin chain in a transverse field as the environment which exhibits a quantum phase transition. Quantum Fisher information lies at the heart of the estimation task. We consider a process of parameter estimation in a spin-j system surrounded by a quantum-critical spin chain. Fisher information in a quantum-critical environment