Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field

Abstract Decoherence of Rabi oscillation in a two-level quantum system consists of two components, a simple exponential decay and a damped oscillation. In dense-ensemble spin systems like negatively charged nitrogen-vacancy (NV−) centers in diamond, fast quantum state decoherence often obscures clea...

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Autores principales:	Jeson Chen, Oliver Y. Chen, Huan-Cheng Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/510d71171bb6499a8447c3fa08a46aaf
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spelling	oai:doaj.org-article:510d71171bb6499a8447c3fa08a46aaf2021-12-02T19:06:40ZRelaxation of a dense ensemble of spins in diamond under a continuous microwave driving field10.1038/s41598-021-95722-z2045-2322https://doaj.org/article/510d71171bb6499a8447c3fa08a46aaf2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95722-zhttps://doaj.org/toc/2045-2322Abstract Decoherence of Rabi oscillation in a two-level quantum system consists of two components, a simple exponential decay and a damped oscillation. In dense-ensemble spin systems like negatively charged nitrogen-vacancy (NV−) centers in diamond, fast quantum state decoherence often obscures clear observation of the Rabi nutation. On the other hand, the simple exponential decay (or baseline decay) of the oscillation in such spin systems can be readily detected but has not been thoroughly explored in the past. This study investigates in depth the baseline decay of dense spin ensembles in diamond under continuously driving microwave (MW). It is found that the baseline decay times of NV− spins decrease with the increasing MW field strength and the MW detuning dependence of the decay times shows a Lorentzian-like spectrum. The experimental findings are in good agreement with simulations based on the Bloch formalism for a simple two-level system in the low MW power region after taking into account the effect of inhomogeneous broadening. This combined investigation provides new insight into fundamental spin relaxation processes under continuous driving electromagnetic fields and paves ways to better understanding of this underexplored phenomena using single NV− centers, which have shown promising applications in quantum computing and quantum metrology.Jeson ChenOliver Y. ChenHuan-Cheng ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jeson Chen Oliver Y. Chen Huan-Cheng Chang Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
description	Abstract Decoherence of Rabi oscillation in a two-level quantum system consists of two components, a simple exponential decay and a damped oscillation. In dense-ensemble spin systems like negatively charged nitrogen-vacancy (NV−) centers in diamond, fast quantum state decoherence often obscures clear observation of the Rabi nutation. On the other hand, the simple exponential decay (or baseline decay) of the oscillation in such spin systems can be readily detected but has not been thoroughly explored in the past. This study investigates in depth the baseline decay of dense spin ensembles in diamond under continuously driving microwave (MW). It is found that the baseline decay times of NV− spins decrease with the increasing MW field strength and the MW detuning dependence of the decay times shows a Lorentzian-like spectrum. The experimental findings are in good agreement with simulations based on the Bloch formalism for a simple two-level system in the low MW power region after taking into account the effect of inhomogeneous broadening. This combined investigation provides new insight into fundamental spin relaxation processes under continuous driving electromagnetic fields and paves ways to better understanding of this underexplored phenomena using single NV− centers, which have shown promising applications in quantum computing and quantum metrology.
format	article
author	Jeson Chen Oliver Y. Chen Huan-Cheng Chang
author_facet	Jeson Chen Oliver Y. Chen Huan-Cheng Chang
author_sort	Jeson Chen
title	Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
title_short	Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
title_full	Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
title_fullStr	Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
title_full_unstemmed	Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
title_sort	relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/510d71171bb6499a8447c3fa08a46aaf
work_keys_str_mv	AT jesonchen relaxationofadenseensembleofspinsindiamondunderacontinuousmicrowavedrivingfield AT oliverychen relaxationofadenseensembleofspinsindiamondunderacontinuousmicrowavedrivingfield AT huanchengchang relaxationofadenseensembleofspinsindiamondunderacontinuousmicrowavedrivingfield
_version_	1718377148844081152

Relaxation of a dense ensemble of spins in diamond under a continuous microwave driving field

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