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Abstract:

We study the decoherence of a qubit weakly coupled to frustrated spin baths. We focus on spin baths described by the classical Ising spin glass and the quantum random transverse Ising model which are known to have complex thermodynamic phase diagrams as a function of an external magnetic field and temperature. Using a combination of numerical and analytical methods, we show that for baths initially in thermal equilibrium, the resulting decoherence is highly sensitive to the nature of the coupling to the environment and is qualitatively different in different parts of the phase diagram. We find an unexpected strong non-Markovian decay of the coherence when the random transverse Ising model bath is prepared in an initial state characterized by a finite temperature paramagnet. This is contrary to the usual case of exponential decay (Markovian) expected for spin baths in finite temperature paramagnetic phases, thereby illustrating the importance of the underlying nontrivial dynamics of interacting quantum spinbaths. © 2009 The American Physical Society.

Registro:

Documento: Artículo
Título:Weak-coupling study of decoherence of a qubit in disordered magnetic environments
Autor:Winograd, E.A.; Rozenberg, M.J.; Chitra, R.
Filiación:Departamento de Física, FCEN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Laboratoire de Physique des Solides, CNRS-UMR 8502, Université de Paris-Sud, Orsay 91405, France
Laboratoire de Physique Theorique de la Matière Condenseé, UMR 7600, Université de Pierre et Marie Curie, Jussieu, Paris 75005, France
Año:2009
Volumen:80
Número:21
DOI: http://dx.doi.org/10.1103/PhysRevB.80.214429
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v80_n21_p_Winograd

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Citas:

---------- APA ----------
Winograd, E.A., Rozenberg, M.J. & Chitra, R. (2009) . Weak-coupling study of decoherence of a qubit in disordered magnetic environments. Physical Review B - Condensed Matter and Materials Physics, 80(21).
http://dx.doi.org/10.1103/PhysRevB.80.214429
---------- CHICAGO ----------
Winograd, E.A., Rozenberg, M.J., Chitra, R. "Weak-coupling study of decoherence of a qubit in disordered magnetic environments" . Physical Review B - Condensed Matter and Materials Physics 80, no. 21 (2009).
http://dx.doi.org/10.1103/PhysRevB.80.214429
---------- MLA ----------
Winograd, E.A., Rozenberg, M.J., Chitra, R. "Weak-coupling study of decoherence of a qubit in disordered magnetic environments" . Physical Review B - Condensed Matter and Materials Physics, vol. 80, no. 21, 2009.
http://dx.doi.org/10.1103/PhysRevB.80.214429
---------- VANCOUVER ----------
Winograd, E.A., Rozenberg, M.J., Chitra, R. Weak-coupling study of decoherence of a qubit in disordered magnetic environments. Phys. Rev. B Condens. Matter Mater. Phys. 2009;80(21).
http://dx.doi.org/10.1103/PhysRevB.80.214429