Advertisement

Decoherence of a Josephson Quantum Bit during its Free Evolution: The Quantronium

  • G. Ithier
  • E. Collin
  • P. Joyez
  • P. J. Meeson
  • D. Vion
  • D. Esteve
  • F. Chiarello
  • A. Shnirman
  • Y. Makhlin
  • G. Schön

Abstract

Relaxation and coherence times of the quantronium, a Josephson Quantum Bit (qubit), as a function of its operating point have been measured. Several coherence times are obtained from complementary techniques such as resonance linewidth, Ramsey fringes, detuning pulse, or spin-echo measurements. We find we can explain their variations by a simple model involving modified l/f charge and phase noise spectral densities.

Keywords

Phase Noise Josephson Junction Coherence Time Qubit State Free Evolution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Y. Nakamura, Yu. A. Pashkin, J. S. Tsai, Nature 398, 786 (1999).CrossRefADSGoogle Scholar
  2. 2.
    D. Vion et al., Science 296, 886 (2002).CrossRefADSGoogle Scholar
  3. 3.
    I. Chiorescu et al., Science 299, 1869 (2003).CrossRefADSGoogle Scholar
  4. 4.
    M. A. Nielsen and I. L. Chuang, Quantum Computation and Quantum Information (Cambridge University Press, Cambridge, 2000).zbMATHGoogle Scholar
  5. 5.
    E. Collin et al., Phys. Rev. Lett. 93, 157005 (2004).CrossRefADSGoogle Scholar
  6. 6.
    V. Bouchiat et al., Phys. Scr. T76, 165 (1998).CrossRefADSGoogle Scholar
  7. 7.
    A. Cottet, PhD thesis, UniversitParis VI, (2002); www-drecam.cea.fr/drecam/spec/Pres/Quantro/ Google Scholar
  8. 8.
    D. Vion, in Quantum Entanglement and Information Processing, D. Estève, J.M. Raimond, and J. Dalibard (eds), (Elsevier, 2004), and refs therein.Google Scholar
  9. 9.
    G. Ithier et al., Phys. Rev. Lett. Google Scholar
  10. 10.
    F. C. Wellstood, C. Urbina and J. Clarke, Appl. Phys. Lett. 50, (1987).Google Scholar
  11. 11.
    Y. Makhlin and A. Shnirman, Phys. Rev. Lett. 92, 178301 (2004).CrossRefADSGoogle Scholar
  12. 12.
    E. Paladino et al., cond-mat/0407484 (2004).Google Scholar

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • G. Ithier
    • 1
  • E. Collin
    • 1
  • P. Joyez
    • 1
  • P. J. Meeson
    • 1
  • D. Vion
    • 1
  • D. Esteve
    • 1
  • F. Chiarello
    • 2
  • A. Shnirman
    • 3
  • Y. Makhlin
    • 4
  • G. Schön
    • 3
  1. 1.Quantronics GroupService de Physique de l’Etat Condensé, Direction des Sciences de la MatièreGif-sur-YvetteFrance
  2. 2.Istituto di Fotonica e NanotecnologiaCNRRomaItaly
  3. 3.Institut für Theoretische FestkörperphysikUniversität KarlsruheKarlsruheGermany
  4. 4.Landau Institute For Theoretical PhysicsMoscowRussia

Personalised recommendations