Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians

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We performed Loschmidt echo nuclear magnetic resonance experiments to study decoherence under a scaled dipolar Hamiltonian by means of a symmetrical time-reversal pulse sequence denominated Proportionally Refocused Loschmidt (PRL) echo. The many-spin system represented by the protons in polycristall...

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Autores principales:	Buljubasich, Lisandro, Sánchez, Claudia M., Dente, Axel D., Levstein, Patricia R., Chattah, Ana K., Pastawski, Horacio M.
Formato:	article
Lenguaje:	Inglés
Publicado:	2022
Materias:	Sequence Analysis NMR Magnetic fields Loschmidt echo Decoherence
Acceso en línea:	http://hdl.handle.net/11086/23832 https://doi.org/10.1063/1.4934221
Aporte de:	Repositorio Digital Universitario (UNC) de Universidad Nacional de Córdoba

id	I10-R14111086-23832
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institution	Universidad Nacional de Córdoba
institution_str	I-10
repository_str	R-141
collection	Repositorio Digital Universitario (UNC)
language	Inglés
topic	Sequence Analysis NMR Magnetic fields Loschmidt echo Decoherence
spellingShingle	Sequence Analysis NMR Magnetic fields Loschmidt echo Decoherence Buljubasich, Lisandro Sánchez, Claudia M. Dente, Axel D. Levstein, Patricia R. Chattah, Ana K. Pastawski, Horacio M. Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
topic_facet	Sequence Analysis NMR Magnetic fields Loschmidt echo Decoherence
description	We performed Loschmidt echo nuclear magnetic resonance experiments to study decoherence under a scaled dipolar Hamiltonian by means of a symmetrical time-reversal pulse sequence denominated Proportionally Refocused Loschmidt (PRL) echo. The many-spin system represented by the protons in polycristalline adamantane evolves through two steps of evolution characterized by the secular part of the dipolar Hamiltonian, scaled down with a factor \|k\| and opposite signs. The scaling factor can be varied continuously from 0 to 1/2, giving access to a range of complexity in the dynamics. The experimental results for the Loschmidt echoes showed a spreading of the decay rates that correlate directly to the scaling factors \|k\|, giving evidence that the decoherence is partially governed by the coherent dynamics. The average Hamiltonian theory was applied to give an insight into the spin dynamics during the pulse sequence. The calculations were performed for every single radio frequency block in contrast to the most widely used form. The first order of the average Hamiltonian numerically computed for an 8-spin system showed decay rates that progressively decrease as the secular dipolar Hamiltonian becomes weaker. Notably, the first order Hamiltonian term neglected by conventional calculations yielded an explanation for the ordering of the experimental decoherence rates. However, there is a strong overall decoherence observed in the experiments which is not reflected by the theoretical results. The fact that the non-inverted terms do not account for this effect is a challenging topic. A number of experiments to further explore the relation of the complete Hamiltonian with this dominant decoherence rate are proposed.
format	article
author	Buljubasich, Lisandro Sánchez, Claudia M. Dente, Axel D. Levstein, Patricia R. Chattah, Ana K. Pastawski, Horacio M.
author_facet	Buljubasich, Lisandro Sánchez, Claudia M. Dente, Axel D. Levstein, Patricia R. Chattah, Ana K. Pastawski, Horacio M.
author_sort	Buljubasich, Lisandro
title	Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
title_short	Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
title_full	Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
title_fullStr	Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
title_full_unstemmed	Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians
title_sort	experimental quantification of decoherence via the loschmidt echo in a many spin system with scaled dipolar hamiltonians
publishDate	2022
url	http://hdl.handle.net/11086/23832 https://doi.org/10.1063/1.4934221
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bdutipo_str	Repositorios
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Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians

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