Confidential Direct Communications: A Quantum Approach Using Continuous Variables

Stefano Pirandola, Samuel L. Braunstein, Seth Lloyd, Stefano Mancini

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We consider the problem of privacy in direct communications, showing how quantum mechanics can be useful to guarantee a certain level of confidentiality. In particular, we review a continuous variable approach recently proposed by us [Pirandola et al., Europhys. Lett., vol. 84, pp. 20013-1-20013-6, 2008]. Here, we analyze the degree of privacy of this technique against a broader class of attacks, which includes non-Gaussian eavesdropping.

Original languageEnglish
Article number5175331
Pages (from-to)1570-1580
Number of pages11
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number6
Publication statusPublished - Nov 2009


  • Cloning
  • continuous variables
  • error correction
  • Gaussian states
  • non-Gaussian attacks
  • quantum communication
  • security

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