Optimal control for quantum detectors

Abstract Quantum systems are promising candidates for sensing of weak signals as they can be highly sensitive to external perturbations, thus providing excellent performance when estimating parameters of external fields. However, when trying to detect weak signals that are hidden by background noise...

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Autores principales:	Paraj Titum, Kevin Schultz, Alireza Seif, Gregory Quiroz, B. D. Clader
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/4dc5edd92d3547f88fe1b2ff37e3c42c
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id	oai:doaj.org-article:4dc5edd92d3547f88fe1b2ff37e3c42c
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spelling	oai:doaj.org-article:4dc5edd92d3547f88fe1b2ff37e3c42c2021-12-02T17:03:51ZOptimal control for quantum detectors10.1038/s41534-021-00383-52056-6387https://doaj.org/article/4dc5edd92d3547f88fe1b2ff37e3c42c2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00383-5https://doaj.org/toc/2056-6387Abstract Quantum systems are promising candidates for sensing of weak signals as they can be highly sensitive to external perturbations, thus providing excellent performance when estimating parameters of external fields. However, when trying to detect weak signals that are hidden by background noise, the signal-to-noise ratio is a more relevant metric than raw sensitivity. We identify, under modest assumptions about the statistical properties of the signal and noise, the optimal quantum control to detect an external signal in the presence of background noise using a quantum sensor. Interestingly, for white background noise, the optimal solution is the simple and well-known spin-locking control scheme. Using numerical techniques, we further generalize these results to the case of background noise with a Lorentzian spectrum. We show that for increasing correlation time, pulse based sequences, such as CPMG, are also close to the optimal control for detecting the signal, with the crossover dependent on the signal frequency. These results show that an optimal detection scheme can be easily implemented in near-term quantum sensors without the need for complicated pulse shaping.Paraj TitumKevin SchultzAlireza SeifGregory QuirozB. D. CladerNature 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 Paraj Titum Kevin Schultz Alireza Seif Gregory Quiroz B. D. Clader Optimal control for quantum detectors
description	Abstract Quantum systems are promising candidates for sensing of weak signals as they can be highly sensitive to external perturbations, thus providing excellent performance when estimating parameters of external fields. However, when trying to detect weak signals that are hidden by background noise, the signal-to-noise ratio is a more relevant metric than raw sensitivity. We identify, under modest assumptions about the statistical properties of the signal and noise, the optimal quantum control to detect an external signal in the presence of background noise using a quantum sensor. Interestingly, for white background noise, the optimal solution is the simple and well-known spin-locking control scheme. Using numerical techniques, we further generalize these results to the case of background noise with a Lorentzian spectrum. We show that for increasing correlation time, pulse based sequences, such as CPMG, are also close to the optimal control for detecting the signal, with the crossover dependent on the signal frequency. These results show that an optimal detection scheme can be easily implemented in near-term quantum sensors without the need for complicated pulse shaping.
format	article
author	Paraj Titum Kevin Schultz Alireza Seif Gregory Quiroz B. D. Clader
author_facet	Paraj Titum Kevin Schultz Alireza Seif Gregory Quiroz B. D. Clader
author_sort	Paraj Titum
title	Optimal control for quantum detectors
title_short	Optimal control for quantum detectors
title_full	Optimal control for quantum detectors
title_fullStr	Optimal control for quantum detectors
title_full_unstemmed	Optimal control for quantum detectors
title_sort	optimal control for quantum detectors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4dc5edd92d3547f88fe1b2ff37e3c42c
work_keys_str_mv	AT parajtitum optimalcontrolforquantumdetectors AT kevinschultz optimalcontrolforquantumdetectors AT alirezaseif optimalcontrolforquantumdetectors AT gregoryquiroz optimalcontrolforquantumdetectors AT bdclader optimalcontrolforquantumdetectors
_version_	1718381847221633024

Optimal control for quantum detectors

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