Optimal frequency measurements with quantum probes

Simon Schmitt; Tuvia Gefen; Daniel Louzon; Christian Osterkamp; Nicolas Staudenmaier; Johannes Lang; Matthew Markham; Alex Retzker; Liam P. McGuinness; Fedor Jelezko

doi:10.1038/s41534-021-00391-5

Optimal frequency measurements with quantum probes

Simon Schmitt, Tuvia Gefen, Daniel Louzon, Christian Osterkamp, Nicolas Staudenmaier, Johannes Lang, Matthew Markham, Alex Retzker, Liam P. McGuinness^*, Fedor Jelezko

^*Corresponding author for this work

Racah Institute of Physics

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

9 Scopus citations

Abstract

Precise frequency measurements are important in applications ranging from navigation and imaging to computation and communication. Here we outline the optimal quantum strategies for frequency discrimination and estimation in the context of quantum spectroscopy, and we compare the effectiveness of different readout strategies. Using a single NV center in diamond, we implement the optimal frequency discrimination protocol to discriminate two frequencies separated by 2 kHz with a single 44 μs measurement, a factor of ten below the Fourier limit. For frequency estimation, we achieve a frequency sensitivity of 1.6 µHz/Hz² for a 1.7 µT amplitude signal, which is within a factor of 2 from the quantum limit. Our results are foundational for discrimination and estimation problems in nanoscale nuclear magnetic resonance spectroscopy.

Original language	English
Article number	55
Journal	npj Quantum Information
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41534-021-00391-5
State	Published - Dec 2021

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AU - Markham, Matthew

AU - Retzker, Alex

AU - McGuinness, Liam P.

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Optimal frequency measurements with quantum probes

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