Home | About Journal | Web Links | E-mail Alerts | RSS RSS Icon | Browse

Decoherence due to an excited-state quantum phase transition in a two-level boson model

Source: Phys. Rev. A 80, 032111 (2009); doi:10.1103/PhysRevA.80.032111

Published 17 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • 05.70.Fh
    Phase transitions: general studies
  • 64.70.Tg
    Quantum phase transitions
  • YEAR: 2009
RELATED DATABASES

To view database links for this article,
you need to log in.
To view database links for this article,
you need to log in.
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
P. Pérez-Fernández,1 A. Relaño,2 J. M. Arias,1 J. Dukelsky,2 and J. E. García-Ramos3
1Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain
2Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain
3Departamento de Física Aplicada, Universidad de Huelva, 21071 Huelva, Spain
The decoherence induced on a single qubit by its interaction with the environment is studied. The environment is modeled as a scalar two-level boson system that can go through either first-order or continuous-excited-state quantum phase transitions, depending on the values of the control parameters. A mean-field method based on the Tamm-Damkoff approximation is worked out in order to understand the observed behavior of the decoherence. Only the continuous-excited-state phase transition produces a noticeable effect in the decoherence of the qubit. This is maximal when the system-environment coupling brings the environment to the critical point for the continuous phase transition. In this situation, the decoherence factor (or the fidelity) goes to zero with a finite-size scaling power law. ©2009 The American Physical Society
History: Received 3 July 2009; published 17 September 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e032111

REFERENCES (16)

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. W. H. Zurek, Rev. Mod. Phys. 75, 715 (2003).
  2. M. Schlosshauer, Rev. Mod. Phys. 76, 1267 (2005).
  3. F. M. Cucchietti, S. Fernandez-Vidal, and J. P. Paz, Phys. Rev. A 75, 032337 (2007).
  4. C. Cormick and J. P. Paz, Phys. Rev. A 77, 022317 (2008).
  5. D. Rossini, T. Calarco, V. Giovannetti, S. Montangero, and R. Fazio, Phys. Rev. A 75, 032333 (2007).
  6. S. Camalet and R. Chitra, Phys. Rev. Lett. 99, 267202 (2007).
  7. Z.-G. Yuan, P. Zhang, and S.-S. Li, Phys. Rev. A 75, 012102 (2007).
  8. A. Relaño, J. M. Arias, J. Dukelsky, J. E. García- Ramos, P. Pérez-Fernández, Phys. Rev. A 78, 060102(R) (2008).
  9. P. Cejnar, S. Heinze, and M. Macek, Phys. Rev. Lett. 99, 100601 (2007).
  10. F. Leyvraz and W. D. Heiss, Phys. Rev. Lett. 95, 050402 (2005)
  11. S. Heinze, P. Cejnar, J. Jolie, and M. Macek, Phys. Rev. C 73, 014306 (2006)
    12. M. Macek, P. Cejnar, J. Jolie, and S. Heinze, ibid. 73, 014307 (2006)
  12. P. Cejnar and P. Stránský, Phys. Rev. E 78, 031130 (2008).
  13. J. Vidal, J. M. Arias, J. Dukelsky, and J. E. Garcí-Ramos, Phys. Rev. C 73, 054305 (2006)
    14. J. M. Arias, J. Dukelsky, J. E. García-Ramos, and J. Vidal, ibid. 75, 014301 (2007).
ADVERTISEMENT