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Abstract:

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.

Registro:

Documento: Artículo
Título:Decoherence induced by a dynamic spin environment: The universal regime
Autor:Cormick, C.; Pablo Paz, J.
Filiación:Departamento de Física, FCEyN, Ciudad Universitaria Pabellón 1, 1428 Buenos Aires, Argentina
Palabras clave:Hamiltonians; Magnetic couplings; Molecular interactions; Phase separation; Phase transitions; Spin dynamics; Decoherence; Energy scale separation; Quantum phase transition; Spin chains; Quantum theory
Año:2008
Volumen:77
Número:2
DOI: http://dx.doi.org/10.1103/PhysRevA.77.022317
Título revista:Physical Review A - Atomic, Molecular, and Optical Physics
Título revista abreviado:Phys Rev A
ISSN:10502947
CODEN:PLRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v77_n2_p_Cormick

Referencias:

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Citas:

---------- APA ----------
Cormick, C. & Pablo Paz, J. (2008) . Decoherence induced by a dynamic spin environment: The universal regime. Physical Review A - Atomic, Molecular, and Optical Physics, 77(2).
http://dx.doi.org/10.1103/PhysRevA.77.022317
---------- CHICAGO ----------
Cormick, C., Pablo Paz, J. "Decoherence induced by a dynamic spin environment: The universal regime" . Physical Review A - Atomic, Molecular, and Optical Physics 77, no. 2 (2008).
http://dx.doi.org/10.1103/PhysRevA.77.022317
---------- MLA ----------
Cormick, C., Pablo Paz, J. "Decoherence induced by a dynamic spin environment: The universal regime" . Physical Review A - Atomic, Molecular, and Optical Physics, vol. 77, no. 2, 2008.
http://dx.doi.org/10.1103/PhysRevA.77.022317
---------- VANCOUVER ----------
Cormick, C., Pablo Paz, J. Decoherence induced by a dynamic spin environment: The universal regime. Phys Rev A. 2008;77(2).
http://dx.doi.org/10.1103/PhysRevA.77.022317