Purification of an unpolarized spin ensemble into entangled singlet pairs

Abstract Dynamical polarization of nuclear spin ensembles is of central importance for magnetic resonance studies, precision sensing and for applications in quantum information theory. Here we propose a scheme to generate long-lived singlet pairs in an unpolarized nuclear spin ensemble which is dipo...

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Autores principales:	Johannes N. Greiner, Durga Bhaktavatsala Rao Dasari, Jörg Wrachtrup
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/05ef199836dd4ebc807e4d51f002ea69
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spelling	oai:doaj.org-article:05ef199836dd4ebc807e4d51f002ea692021-12-02T11:52:15ZPurification of an unpolarized spin ensemble into entangled singlet pairs10.1038/s41598-017-00603-z2045-2322https://doaj.org/article/05ef199836dd4ebc807e4d51f002ea692017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00603-zhttps://doaj.org/toc/2045-2322Abstract Dynamical polarization of nuclear spin ensembles is of central importance for magnetic resonance studies, precision sensing and for applications in quantum information theory. Here we propose a scheme to generate long-lived singlet pairs in an unpolarized nuclear spin ensemble which is dipolar coupled to the electron spins of a Nitrogen Vacancy center in diamond. The quantum mechanical back-action induced by frequent spin-selective readout of the NV centers allows the nuclear spins to pair up into maximally entangled singlet pairs. Counterintuitively, the robustness of the pair formation to dephasing noise improves with increasing size of the spin ensemble. We also show how the paired nuclear spin state allows for enhanced sensing capabilities of NV centers in diamond.Johannes N. GreinerDurga Bhaktavatsala Rao DasariJörg WrachtrupNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Johannes N. Greiner Durga Bhaktavatsala Rao Dasari Jörg Wrachtrup Purification of an unpolarized spin ensemble into entangled singlet pairs
description	Abstract Dynamical polarization of nuclear spin ensembles is of central importance for magnetic resonance studies, precision sensing and for applications in quantum information theory. Here we propose a scheme to generate long-lived singlet pairs in an unpolarized nuclear spin ensemble which is dipolar coupled to the electron spins of a Nitrogen Vacancy center in diamond. The quantum mechanical back-action induced by frequent spin-selective readout of the NV centers allows the nuclear spins to pair up into maximally entangled singlet pairs. Counterintuitively, the robustness of the pair formation to dephasing noise improves with increasing size of the spin ensemble. We also show how the paired nuclear spin state allows for enhanced sensing capabilities of NV centers in diamond.
format	article
author	Johannes N. Greiner Durga Bhaktavatsala Rao Dasari Jörg Wrachtrup
author_facet	Johannes N. Greiner Durga Bhaktavatsala Rao Dasari Jörg Wrachtrup
author_sort	Johannes N. Greiner
title	Purification of an unpolarized spin ensemble into entangled singlet pairs
title_short	Purification of an unpolarized spin ensemble into entangled singlet pairs
title_full	Purification of an unpolarized spin ensemble into entangled singlet pairs
title_fullStr	Purification of an unpolarized spin ensemble into entangled singlet pairs
title_full_unstemmed	Purification of an unpolarized spin ensemble into entangled singlet pairs
title_sort	purification of an unpolarized spin ensemble into entangled singlet pairs
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/05ef199836dd4ebc807e4d51f002ea69
work_keys_str_mv	AT johannesngreiner purificationofanunpolarizedspinensembleintoentangledsingletpairs AT durgabhaktavatsalaraodasari purificationofanunpolarizedspinensembleintoentangledsingletpairs AT jorgwrachtrup purificationofanunpolarizedspinensembleintoentangledsingletpairs
_version_	1718395084524748800

Purification of an unpolarized spin ensemble into entangled singlet pairs

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