Decoherence from spin environments

We examine two exactly solvable models of decoherence-a central spin-system, (i) with and (ii) without a self-Hamiltonian, interacting with a collection of environment spins. In the absence of a self-Hamiltonian we show that in this model (introduced some time ago to illustrate environment-induced s...

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Autores principales: Cucchietti, F.M., Paz, J.P., Zurek, W.H.
Formato: JOUR
Materias:
Gaussian decay
Pointer states
Spectral features
Acoustic wave propagation
Gaussian noise (electronic)
High energy physics
Hamiltonians
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v72_n5_p_Cucchietti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10502947_v72_n5_p_Cucchietti
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spelling todo:paper_10502947_v72_n5_p_Cucchietti2023-10-03T15:59:46Z Decoherence from spin environments Cucchietti, F.M. Paz, J.P. Zurek, W.H. Gaussian decay Pointer states Spectral features Acoustic wave propagation Gaussian noise (electronic) High energy physics Hamiltonians We examine two exactly solvable models of decoherence-a central spin-system, (i) with and (ii) without a self-Hamiltonian, interacting with a collection of environment spins. In the absence of a self-Hamiltonian we show that in this model (introduced some time ago to illustrate environment-induced superselection) generic assumptions about the coupling strengths can lead to a universal (Gaussian) suppression of coherence between pointer states. On the other hand, we show that when the dynamics of the central spin is dominant a different regime emerges, which is characterized by a non-Gaussian decay and a dramatically different set of pointer states. We explore the regimes of validity of the Gaussian decay and discuss its relation to the spectral features of the environment and to the Loschmidt echo (or fidelity). © 2005 The American Physical Society. Fil:Paz, J.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v72_n5_p_Cucchietti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Gaussian decay
Pointer states
Spectral features
Acoustic wave propagation
Gaussian noise (electronic)
High energy physics
Hamiltonians
spellingShingle Gaussian decay
Pointer states
Spectral features
Acoustic wave propagation
Gaussian noise (electronic)
High energy physics
Hamiltonians
Cucchietti, F.M.
Paz, J.P.
Zurek, W.H.
Decoherence from spin environments
topic_facet Gaussian decay
Pointer states
Spectral features
Acoustic wave propagation
Gaussian noise (electronic)
High energy physics
Hamiltonians
description We examine two exactly solvable models of decoherence-a central spin-system, (i) with and (ii) without a self-Hamiltonian, interacting with a collection of environment spins. In the absence of a self-Hamiltonian we show that in this model (introduced some time ago to illustrate environment-induced superselection) generic assumptions about the coupling strengths can lead to a universal (Gaussian) suppression of coherence between pointer states. On the other hand, we show that when the dynamics of the central spin is dominant a different regime emerges, which is characterized by a non-Gaussian decay and a dramatically different set of pointer states. We explore the regimes of validity of the Gaussian decay and discuss its relation to the spectral features of the environment and to the Loschmidt echo (or fidelity). © 2005 The American Physical Society.
format JOUR
author Cucchietti, F.M.
Paz, J.P.
Zurek, W.H.
author_facet Cucchietti, F.M.
Paz, J.P.
Zurek, W.H.
author_sort Cucchietti, F.M.
title Decoherence from spin environments
title_short Decoherence from spin environments
title_full Decoherence from spin environments
title_fullStr Decoherence from spin environments
title_full_unstemmed Decoherence from spin environments
title_sort decoherence from spin environments
url http://hdl.handle.net/20.500.12110/paper_10502947_v72_n5_p_Cucchietti
work_keys_str_mv AT cucchiettifm decoherencefromspinenvironments
AT pazjp decoherencefromspinenvironments
AT zurekwh decoherencefromspinenvironments
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