Optimal frequency measurements with quantum probes

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 effectiven...

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Autores principales:	Simon Schmitt, Tuvia Gefen, Daniel Louzon, Christian Osterkamp, Nicolas Staudenmaier, Johannes Lang, Matthew Markham, Alex Retzker, Liam P. McGuinness, Fedor Jelezko
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/7711b3a059e444cfab0a1f5a74e7a0c2
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id	oai:doaj.org-article:7711b3a059e444cfab0a1f5a74e7a0c2
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spelling	oai:doaj.org-article:7711b3a059e444cfab0a1f5a74e7a0c22021-12-02T13:26:25ZOptimal frequency measurements with quantum probes10.1038/s41534-021-00391-52056-6387https://doaj.org/article/7711b3a059e444cfab0a1f5a74e7a0c22021-04-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00391-5https://doaj.org/toc/2056-6387Abstract 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.Simon SchmittTuvia GefenDaniel LouzonChristian OsterkampNicolas StaudenmaierJohannes LangMatthew MarkhamAlex RetzkerLiam P. McGuinnessFedor JelezkoNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Simon Schmitt Tuvia Gefen Daniel Louzon Christian Osterkamp Nicolas Staudenmaier Johannes Lang Matthew Markham Alex Retzker Liam P. McGuinness Fedor Jelezko Optimal frequency measurements with quantum probes
description	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.
format	article
author	Simon Schmitt Tuvia Gefen Daniel Louzon Christian Osterkamp Nicolas Staudenmaier Johannes Lang Matthew Markham Alex Retzker Liam P. McGuinness Fedor Jelezko
author_facet	Simon Schmitt Tuvia Gefen Daniel Louzon Christian Osterkamp Nicolas Staudenmaier Johannes Lang Matthew Markham Alex Retzker Liam P. McGuinness Fedor Jelezko
author_sort	Simon Schmitt
title	Optimal frequency measurements with quantum probes
title_short	Optimal frequency measurements with quantum probes
title_full	Optimal frequency measurements with quantum probes
title_fullStr	Optimal frequency measurements with quantum probes
title_full_unstemmed	Optimal frequency measurements with quantum probes
title_sort	optimal frequency measurements with quantum probes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7711b3a059e444cfab0a1f5a74e7a0c2
work_keys_str_mv	AT simonschmitt optimalfrequencymeasurementswithquantumprobes AT tuviagefen optimalfrequencymeasurementswithquantumprobes AT daniellouzon optimalfrequencymeasurementswithquantumprobes AT christianosterkamp optimalfrequencymeasurementswithquantumprobes AT nicolasstaudenmaier optimalfrequencymeasurementswithquantumprobes AT johanneslang optimalfrequencymeasurementswithquantumprobes AT matthewmarkham optimalfrequencymeasurementswithquantumprobes AT alexretzker optimalfrequencymeasurementswithquantumprobes AT liampmcguinness optimalfrequencymeasurementswithquantumprobes AT fedorjelezko optimalfrequencymeasurementswithquantumprobes
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Optimal frequency measurements with quantum probes

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