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Confidential Direct Communications: A Quantum Approach Using Continuous Variables

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4 Author(s)
Pirandola, S. ; Center for Extreme Quantum Inf. Theor. (xQIT), Massachusetts Inst. of Technol., Cambridge, MA, USA ; Braunstein, S.L. ; Lloyd, S. ; Mancini, S.

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.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:15 ,  Issue: 6 )