Achieving the ultimate precision limit with a weakly interacting quantum probe

D. Cohen; T. Gefen; L. Ortiz; A. Retzker

doi:10.1038/s41534-020-00313-x

Achieving the ultimate precision limit with a weakly interacting quantum probe

D. Cohen^*, T. Gefen, L. Ortiz, A. Retzker

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The ultimate precision limit in estimating the Larmor frequency of N unentangled qubits is well established, and is highly important for magnetometers, gyroscopes, and other types of quantum sensors. However, this limit assumes perfect projective measurements of the quantum registers. This requirement is not practical in many physical systems, such as NMR spectroscopy, where a weakly interacting external probe is used as a measurement device. Here, we show that in the framework of quantum nano-NMR spectroscopy, in which these limitations are inherent, the ultimate precision limit is still achievable using control and a finely tuned measurement.

Original language	American English
Article number	83
Journal	npj Quantum Information
Volume	6
Issue number	1
DOIs	https://doi.org/10.1038/s41534-020-00313-x
State	Published - 1 Dec 2020

Bibliographical note

Funding Information:
A.R. acknowledges the support of ERC grant QRES, project No. 770929, grant agreement No. 667192 (Hyperdiamond), and the ASTERIQS and DiaPol projects. T.G. is supported by the Adams fellowship of the Israeli academy of sciences and humanities.

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© 2020, The Author(s).

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Achieving the ultimate precision limit with a weakly interacting quantum probe

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