Noise-robust quantum sensing via optimal multi-probe spectroscopy
Authors: Mueller M., Gherardini S., Caruso F.
Autors Affiliation: [Mueller, Matthias M.; Gherardini, Stefano; Caruso, Filippo] CNR INO ,QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy and LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy and Univ Firenze, Dipartimento Fis & Astron, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, Italy
Abstract: The dynamics of quantum systems are unavoidably influenced by their environment, but in turn observing a quantum system (probe) can allow one to measure its environment: Measurements and controlled manipulation of the probe such as dynamical decoupling sequences as an extension of the Ramsey interference measurement allow to spectrally resolve a noise field coupled to the probe. Here, we introduce fast and robust estimation strategies for the characterization of the spectral properties of classical and quantum dephasing environments. These strategies are based on filter function orthogonalization, optimal control filters maximizing the relevant Fisher Information and multi-qubit entanglement. We investigate and quantify the robustness of the schemes under different types of noise such as finite-precision measurements, dephasing of the probe, spectral leakage and slow temporal fluctuations of the spectrum.
Journal/Review: SCIENTIFIC REPORTS
Volume: 8 Pages from: 14278-1 to: 14278-17
KeyWords: systems; QUBIT; DOI: 10.1038/s41598-018-32434-xCitations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-10-13References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here