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dc.contributor.author
Zurek, Wojciech  
dc.contributor.author
Cucchietti, Fernando  
dc.contributor.author
Paz, Juan Pablo  
dc.date.available
2019-01-09T18:07:37Z  
dc.date.issued
2007-12  
dc.identifier.citation
Zurek, Wojciech; Cucchietti, Fernando; Paz, Juan Pablo; Gaussian Decoherence and Gaussian Echo from Spin Environments; Polish Academy of Sciences. Institute of Physics; Acta Physica Polonica B; 38; 12-2007; 1685-1694  
dc.identifier.issn
0587-4254  
dc.identifier.uri
http://hdl.handle.net/11336/67799  
dc.description.abstract
We examine an exactly solvable model of decoherence -- a spin-system interacting with a collection of environment spins. We show that in this simple model (introduced some time ago to illustrate environment--induced superselection) generic assumptions about the coupling strengths lead to a universal (Gaussian) suppression of coherence between pointer states. We explore the regime of validity of this result and discuss its relation to spectral features of the environment. We also consider its relevance to the experiments on the so-called Loschmidt echo (which measures, in effect, the fidelity between the initial and time-reversed or "echo" signal). In particular, we show that for partial reversals (e.g., when of only a part of the total Hamiltonian changes sign) fidelity will exhibit a Gaussian dependence on the time of reversal. In such cases echo may become independent of the details of the reversal procedure or the specifics of the coupling to the environment. This puzzling behavior was observed in several NMR experiments. Natural candidates for such two environments (one of which is easily reversed, while the other is ``irreversible´´) are suggested for the experiment involving ferrocene.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Polish Academy of Sciences. Institute of Physics  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Decoherence  
dc.subject
Quantum Information  
dc.subject.classification
Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Gaussian Decoherence and Gaussian Echo from Spin Environments  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-01-09T14:23:55Z  
dc.identifier.eissn
1509-5770  
dc.journal.volume
38  
dc.journal.pagination
1685-1694  
dc.journal.pais
Polonia  
dc.journal.ciudad
Kiex  
dc.description.fil
Fil: Zurek, Wojciech. Los Alamos National High Magnetic Field Laboratory; Estados Unidos  
dc.description.fil
Fil: Cucchietti, Fernando. Los Alamos National High Magnetic Field Laboratory; Estados Unidos  
dc.description.fil
Fil: Paz, Juan Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina  
dc.journal.title
Acta Physica Polonica B