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This research outlines a concrete physical measurement scheme using bosonic ancillas and general-dyne measurements to approach the Holevo-Nagaoka bound for quantum multiparameter estimation. By detailing specific experimental setups, the work bridges theoretical precision limits with practical implementation in many-body physics systems. This advancement is significant for optimizing sensing protocols where multiple independent parameters must be estimated simultaneously at ultimate accuracy.

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Approaching the Ultimate Limit of Quantum Multiparameter Estimation by Many-Body Physics

arXiv17 august 20261 min de cititArticolul și perspectiva sunt în engleză.

arXiv:2603.17955v3 Announce Type: replace Abstract: I propose a physical measurement scheme on multiple independent and identically distributed quantum objects to approach the Holevo--Nagaoka bound for quantum multiparameter estimation. The scheme entails a physical interaction of the objects with bosonic ancillas, followed by a general-dyne measurement of the ancillas. The proposal offers a more concrete description of the experimental setup needed to achieve the ultimate precision limit set by the bound.

Abstract:I propose a physical measurement scheme on multiple independent and identically distributed quantum objects to approach the Holevo--Nagaoka bound for quantum multiparameter estimation. The scheme entails a physical interaction of the objects with bosonic ancillas, followed by a general-dyne measurement of the ancillas. The proposal offers a more concrete description of the experimental setup needed to achieve the ultimate precision limit set by the bound.

10 pages including end matter and supplemental material, 2 figures. v3: accepted version, elaborated on the imaging example and the general-dyne measurement

arXiv:2603.17955 [quant-ph]

(or arXiv:2603.17955v3 [quant-ph] for this version)

https://doi.org/10.1103/cghv-j44h DOI(s) linking to related resources

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