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Optical Qubit Using Linear Elements

  • Matteo G. A. Paris

Abstract

A conditional scheme to prepare optical superposition of the vacuum and onephoton states using linear elements (beam splitters and phase-shifters) and avalanche photodetectors is suggested.

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References

  1. [1]
    G. M. D’Ariano, L. Maccone, M. G. A. Paris, M. F. Sacchi, Phys. Rev. A 61 053817 (2000); Acta Phys. Slov. 49, 659 (1999).ADSCrossRefGoogle Scholar
  2. [2]
    M. Dakna, J. Clausen, L. Knoll, and D.-G. Welsch, Phys. Rev. A 59, 1658 (1999); here the effects of non unit quantum efficiency of photodetectors are not taken into account.CrossRefADSGoogle Scholar
  3. [3]
    D. T. Pegg, L. S. Philips, S. M. Barnett, Phys. Rev. Lett. 81, 1604 (1998); the authors employ a linear model (not avalanche) for photodetectors, thus overestimating the achievable fidelity.CrossRefADSGoogle Scholar
  4. [4]
    M. G. A. Paris, Phys. Rev. A 62, 033815 (2000).CrossRefADSGoogle Scholar
  5. [5]
    M. G. A. Paris, Phys. Rev. A 59, 1615 (1999).CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Matteo G. A. Paris
    • 1
    • 2
  1. 1.Quantum Optics GroupUnità INFMPaviaItaly
  2. 2.Dipartimento di Fisica “A. Volta”Università di PaviaPaviaItaly

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