KMS Of Academy of mathematics and systems sciences, CAS
Quantifying unsharpness of measurements via uncertainty | |
Liu, Yizhou1; Luo, Shunlong2,3 | |
2021-11-29 | |
发表期刊 | PHYSICAL REVIEW A |
ISSN | 2469-9926 |
卷号 | 104期号:5页码:10 |
摘要 | In the conventional axiomatic formalism of quantum mechanics, a physical measurement of a quantum observable is mathematically represented by the spectral decomposition of the Hermitian operator associated with the observable. This constitutes the scenario of a Luders (projective) measurement, which includes a von Neumann (rank-one projective) measurement as a special and prominent instance. In this context, the measurement is called sharp in the sense that each measurement operator is an orthogonal projection (eigenprojection of the observable). In the modern operational formalism, a measurement is represented by a positive-operator valued measure (POVM), which consists of a family of non-negative definite operators (measurement operators, effects) summing to the identity. In this scenario, a measurement is called unsharp (fuzzy) if some measurement operators are not orthogonal projections. A natural question arises as to how to quantify unsharpness of a measurement. In this work, we address this issue in terms of uncertainty. For this purpose, we study a family of observables associated with a measurement and their uncertainty. By exploiting the difference between the (total) measurement uncertainty and the observable uncertainty, we are led to some information-theoretic quantifiers of unsharpness. We reveal their basic properties and illustrate them through some important measurements. In particular, we characterize Luders measurements and equiangular POVMs as extreme measurements in terms of unsharpness. |
DOI | 10.1103/PhysRevA.104.052227 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Key R&D Program of China[2020YFA0712700] ; National Natural Science Foundation of China[11875317] ; National Natural Science Foundation of China[61833010] ; ORIC project from TEEP |
WOS研究方向 | Optics ; Physics |
WOS类目 | Optics ; Physics, Atomic, Molecular & Chemical |
WOS记录号 | WOS:000724666100013 |
出版者 | AMER PHYSICAL SOC |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.amss.ac.cn/handle/2S8OKBNM/59644 |
专题 | 应用数学研究所 |
通讯作者 | Luo, Shunlong |
作者单位 | 1.Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Liu, Yizhou,Luo, Shunlong. Quantifying unsharpness of measurements via uncertainty[J]. PHYSICAL REVIEW A,2021,104(5):10. |
APA | Liu, Yizhou,&Luo, Shunlong.(2021).Quantifying unsharpness of measurements via uncertainty.PHYSICAL REVIEW A,104(5),10. |
MLA | Liu, Yizhou,et al."Quantifying unsharpness of measurements via uncertainty".PHYSICAL REVIEW A 104.5(2021):10. |
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