Discrepancies between decoherence and the Loschmidt echo

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The Loschmidt echo and the purity are two quantities that can provide invaluable information about the evolution of a quantum system. While the Loschmidt echo characterizes instability and sensitivity to perturbations, purity measures the loss of coherence produced by an environment coupled to the s...

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Autor principal: Casabone, B.
Otros Autores: García-Mata, Ignacio, Wisniacki, D.A
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2010
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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245 1 0 |a Discrepancies between decoherence and the Loschmidt echo 
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270 1 0 |m Casabone, B.; Departamento de Física and IFIBA, FCEyN, UBA, C1428EGA Buenos Aires, Argentina 
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506 |2 openaire  |e Política editorial 
520 3 |a The Loschmidt echo and the purity are two quantities that can provide invaluable information about the evolution of a quantum system. While the Loschmidt echo characterizes instability and sensitivity to perturbations, purity measures the loss of coherence produced by an environment coupled to the system. For classically chaotic systems both quantities display a number of - supposedly universal - regimes that can lead to think of them as equivalent quantities. We study the decay of the Loschmidt echo and the purity for systems with finite-dimensional Hilbert space and present numerical evidence of some fundamental differences between them. © 2010 Europhysics Letters Association.  |l eng 
593 |a Departamento de Física and IFIBA, FCEyN, UBA, C1428EGA Buenos Aires, Argentina 
593 |a Departamento de Física, Lab. TANDAR, Comisión Nacional de Energía Atómica, Av. del Libertador 8250, 1429 Buenos Aires, Argentina 
700 1 |a García-Mata, Ignacio 
700 1 |a Wisniacki, D.A. 
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