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- Title
弱测量在提高量子参数估计精度中的应用.
- Authors
刘丽君
- Abstract
Quantum metrology concerns how to achieve the highest precision of physical parameters by quantum resources, 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 taken 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.
- Subjects
QUANTUM mechanics; ACCURACY; METROLOGY; QUANTUM information science; QUANTUM computing
- Publication
Control Theory & Applications / Kongzhi Lilun Yu Yinyong, 2017, Vol 34, Issue 11, p1471
- ISSN
1000-8152
- Publication type
Article
- DOI
10.7641/CTA.2017.70613