Decoherence induced by a dynamic spin environment: The universal regime

This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes i...

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Detalles Bibliográficos
Autores principales:	Cormick, M. Cecilia, Paz, Juan Pablo
Publicado:	2008
Materias:	Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v77_n2_p_Cormick http://hdl.handle.net/20.500.12110/paper_10502947_v77_n2_p_Cormick
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_10502947_v77_n2_p_Cormick
record_format	dspace
spelling	paper:paper_10502947_v77_n2_p_Cormick2023-06-08T16:02:27Z Decoherence induced by a dynamic spin environment: The universal regime Cormick, M. Cecilia Paz, Juan Pablo Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes independent of the strength of the coupling with the environment. It is shown that, although such a regime does exist, as previously established by Cucchietti [Phys. Rev. A 75, 032337 (2007)], it is not a clear signature of a quantum phase transition in the environment. In fact, this kind of universality also exists in the absence of quantum phase transitions. A universal regime can be related to the existence of an energy scale separation between the Hamiltonian of the environment and the one characterizing the system-environment interaction. The results presented also indicate that in the strong-coupling regime the quantum phase transition does not produce an enhancement of decoherence (as opposed to what happens in the weak-coupling regime). © 2008 The American Physical Society. Fil:Cormick, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pablo Paz, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v77_n2_p_Cormick http://hdl.handle.net/20.500.12110/paper_10502947_v77_n2_p_Cormick
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory
spellingShingle	Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory Cormick, M. Cecilia Paz, Juan Pablo Decoherence induced by a dynamic spin environment: The universal regime
topic_facet	Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory
description	This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes independent of the strength of the coupling with the environment. It is shown that, although such a regime does exist, as previously established by Cucchietti [Phys. Rev. A 75, 032337 (2007)], it is not a clear signature of a quantum phase transition in the environment. In fact, this kind of universality also exists in the absence of quantum phase transitions. A universal regime can be related to the existence of an energy scale separation between the Hamiltonian of the environment and the one characterizing the system-environment interaction. The results presented also indicate that in the strong-coupling regime the quantum phase transition does not produce an enhancement of decoherence (as opposed to what happens in the weak-coupling regime). © 2008 The American Physical Society.
author	Cormick, M. Cecilia Paz, Juan Pablo
author_facet	Cormick, M. Cecilia Paz, Juan Pablo
author_sort	Cormick, M. Cecilia
title	Decoherence induced by a dynamic spin environment: The universal regime
title_short	Decoherence induced by a dynamic spin environment: The universal regime
title_full	Decoherence induced by a dynamic spin environment: The universal regime
title_fullStr	Decoherence induced by a dynamic spin environment: The universal regime
title_full_unstemmed	Decoherence induced by a dynamic spin environment: The universal regime
title_sort	decoherence induced by a dynamic spin environment: the universal regime
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v77_n2_p_Cormick http://hdl.handle.net/20.500.12110/paper_10502947_v77_n2_p_Cormick
work_keys_str_mv	AT cormickmcecilia decoherenceinducedbyadynamicspinenvironmenttheuniversalregime AT pazjuanpablo decoherenceinducedbyadynamicspinenvironmenttheuniversalregime
_version_	1768545610747609088

Decoherence induced by a dynamic spin environment: The universal regime

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