Noise-robust quantum sensing via optimal multi-probe spectroscopy

Year: 2018

Authors: Mueller M., Gherardini S., Caruso F.

Autors Affiliation: QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; CNR, INO, Largo Enrico Fermi 6, I-50125 Florence, Italy; LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; 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

More Information: The authors gratefully acknowledge Gershon Kurizki, Jorg Wrachtrup and Durga Dasari for useful discussions. This work was financially supported from the Fondazione CR Firenze through the project Q-BIOSCAN.
KeyWords: Spectral Leakage, Fisher Information, Filter Operation Time, Pulse Transition Function, Dephasing Rate, Quantum metrology
DOI: 10.1038/s41598-018-32434-x

Citations: 22
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