Linear Ascending Metrological Algorithm

M. R. Perelshtein*, N. S. Kirsanov, V. V. Zemlyanov, A. Lebedev, G. Blatter, V. M. Vinokur, G. B. Lesovik

*Corresponding author for this work

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Abstract

The ubiquitous presence of shot noise sets a fundamental limit to the measurement precision in classical metrology. Recent advances in quantum devices and novel quantum algorithms utilizing interference effects are opening new routes for overcoming the detrimental noise tyranny. However, further progress is limited by the restricted capability of existing algorithms to account for the decoherence pervading experimental implementations. Here, adopting a systematic approach to the evaluation of effectiveness of metrological procedures, we devise the Linear Ascending Metrological Algorithm (LAMA), which offers a remarkable increase in precision in the demanding situation where a decohering quantum system is used to measure a continuously distributed variable. We introduce our protocol in the context of magnetic field measurements, assuming superconducting transmon devices as sensors operated in a qudit mode. Our findings demonstrate a quantum-metrological procedure capable of mitigating detrimental dephasing and relaxation effects.

Original languageEnglish
Article number013257
Number of pages12
JournalPHYSICAL REVIEW RESEARCH
Volume3
Issue number1
DOIs
Publication statusPublished - 19 Mar 2021
MoE publication typeA1 Journal article-refereed

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