控制理论与应用2017，Vol.34Issue(11)：1471-1476,6.DOI:10.7641/CTA.2017.70613
弱测量在提高量子参数估计精度中的应用
Usefulness of weak measurements in improving the precision of quantum parameter estimation
摘要
Abstract
Quantum metrology concerns how to achieve the highest precision of physical parameters by quantum re-sources, which has broad applications in many fields. For closed quantum systems, the accuracy attained with entangled quantum probes can significantly surmount that of classical strategies. However, when noises such as decoherence are tak-en into account, the quantum gain may be jeopardized. In this paper, weak measurement is adopted to improve estimation precision in the presence of amplitude-damping decoherence, and it is demonstrated that the method of weak measurement can recover estimation precision to the Heisenberg limit, even though the success probability is in a exponential attenuation. Furthermore, the effectiveness of weak measurement in improving the estimation precision is investigated when ancillary systems are implemented.关键词
量子参数估计/弱测量/精度极限Key words
quantum parameter estimation/weak measurement/precision limit分类
数理科学引用本文复制引用
刘丽君..弱测量在提高量子参数估计精度中的应用[J].控制理论与应用,2017,34(11):1471-1476,6.基金项目
国家自然科学基金项目(61703254)资助. Supported by National Natural Science Foundation of China (61703254). （61703254）
