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Quantum Fisher information for a single qubit system

机译:单量子位系统的Quantum Fisher信息

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摘要

The Fisher information is used for quantum state estimation and considered as a physical resource associated with various quantities. The concept of Fisher information in terms of the atomic density operator is introduced. We give the correlation between the Fisher information and quantum entanglement during the time evolution for a trapped ion in laser field. The effect of the initial state setting on the classical Fisher information and quantum Fisher information is examined. The results show that the Fisher information is efficacious tool to study single qubit dynamics as an indicator of entanglement under certain conditions. Our observations may have important implications in exploiting this quantity in quantum information processing and transmission.
机译:Fisher信息用于量子状态估计,并被视为与各种数量关联的物理资源。介绍了用原子密度算符表示费舍尔信息的概念。我们给出了被捕获离子在激光场中的时间演化过程中的费舍尔信息与量子纠缠之间的相关性。研究了初始状态设置对经典Fisher信息和量子Fisher信息的影响。结果表明,Fisher信息是研究单个量子位动力学作为在某些条件下纠缠指标的有效工具。我们的观察可能对在量子信息处理和传输中利用这一数量具有重要意义。

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