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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Autor principal: Paz, Juan Pablo
Publicado: 2005
Materias:
Gaussian decay
Pointer states
Spectral features
Acoustic wave propagation
Gaussian noise (electronic)
High energy physics
Hamiltonians
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v72_n5_p_Cucchietti
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 paper:paper_10502947_v72_n5_p_Cucchietti
record_format dspace
spelling paper:paper_10502947_v72_n5_p_Cucchietti2023-06-08T16:02:19Z Decoherence from spin environments Paz, Juan Pablo 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. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v72_n5_p_Cucchietti 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
Paz, Juan Pablo
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.
author Paz, Juan Pablo
author_facet Paz, Juan Pablo
author_sort Paz, Juan Pablo
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
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v72_n5_p_Cucchietti
http://hdl.handle.net/20.500.12110/paper_10502947_v72_n5_p_Cucchietti
work_keys_str_mv AT pazjuanpablo decoherencefromspinenvironments
_version_ 1768544002523529216

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