Learning quantum systems

V Gebhart, R Santagati, AA Gentile, EM Gauger… - Nature Reviews …, 2023 - nature.com
The future development of quantum technologies relies on creating and manipulating
quantum systems of increasing complexity, with key applications in computation, simulation …

Optimal scheme for quantum metrology

J Liu, M Zhang, H Chen, L Wang… - Advanced Quantum …, 2022 - Wiley Online Library
Quantum metrology can achieve far better precision than classical metrology, and is one of
the most important applications of quantum technologies in the real world. To attain the …

[HTML][HTML] Photonic quantum metrology

E Polino, M Valeri, N Spagnolo, F Sciarrino - AVS Quantum Science, 2020 - pubs.aip.org
Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

[HTML][HTML] A perspective on multiparameter quantum metrology: From theoretical tools to applications in quantum imaging

F Albarelli, M Barbieri, MG Genoni, I Gianani - Physics Letters A, 2020 - Elsevier
The interest in a system often resides in the interplay among different parameters governing
its evolution. It is thus often required to access many of them at once for a complete …

Fisher information in noisy intermediate-scale quantum applications

JJ Meyer - Quantum, 2021 - quantum-journal.org
The recent advent of noisy intermediate-scale quantum devices, especially near-term
quantum computers, has sparked extensive research efforts concerned with their possible …

Multiple-phase quantum interferometry: real and apparent gains of measuring all the phases simultaneously

W Górecki, R Demkowicz-Dobrzański - Physical Review Letters, 2022 - APS
We characterize operationally meaningful quantum gains in a paradigmatic model of
lossless multiple-phase interferometry and stress the insufficiency of the analysis based …

Continuous symmetries and approximate quantum error correction

P Faist, S Nezami, VV Albert, G Salton, F Pastawski… - Physical Review X, 2020 - APS
Quantum error correction and symmetry arise in many areas of physics, including many-
body systems, metrology in the presence of noise, fault-tolerant computation, and …

Probe incompatibility in multiparameter noisy quantum metrology

F Albarelli, R Demkowicz-Dobrzański - Physical Review X, 2022 - APS
We derive fundamental bounds on the maximal achievable precision in multiparameter
noisy quantum metrology, valid under the most general entanglement-assisted adaptive …

Asymptotic theory of quantum channel estimation

S Zhou, L Jiang - PRX Quantum, 2021 - APS
The quantum Fisher information (QFI), as a function of quantum states, measures the
amount of information that a quantum state carries about an unknown parameter. The …

Using quantum metrological bounds in quantum error correction: A simple proof of the approximate eastin-knill theorem

A Kubica, R Demkowicz-Dobrzański - Physical Review Letters, 2021 - APS
We present a simple proof of the approximate Eastin-Knill theorem, which connects the
quality of a quantum error-correcting code (QECC) with its ability to achieve a universal set …