Quantum Fisher information from randomized measurements - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2021

Quantum Fisher information from randomized measurements

Résumé

The quantum Fisher information (QFI) is a fundamental quantity of interest in many areas from quantum metrology to quantum information theory. It can in particular be used as a witness to establish the degree of multi-particle entanglement in quantum many-body-systems. In this work, we use polynomials of the density matrix to construct monotonically increasing lower bounds that converge to the QFI. Using randomized measurements we propose a protocol to accurately estimate these lower bounds in state-of-art quantum technological platforms. We perform numerical analysis to obtain the number of measurements required to overcome statistical errors for the lower bound estimates and provide two examples of applications of the method in quantum systems made of coupled qubits and collective spins.
Fichier principal
Vignette du fichier
PhysRevLett.127.260501.pdf (737.67 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03357478 , version 1 (25-08-2023)

Identifiants

Citer

Aniket Rath, Cyril Branciard, Anna Minguzzi, Benoît Vermersch. Quantum Fisher information from randomized measurements. Physical Review Letters, 2021, 127 (26), pp.260501. ⟨10.1103/PhysRevLett.127.260501⟩. ⟨hal-03357478⟩
53 Consultations
88 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More