Comment on 'Secure Communication using mesoscopic coherent states', Barbosa et al, Phys Rev Lett 90, 227901 (2003)

Details Comment on 'Secure Communication using mesoscopic coherent states', Barbosa et al, Phys Rev Lett 90, 227901 (2003) Comment on 'Secure Communication using mesoscopic coherent states', Barbosa et al, Phys Rev Lett 90, 227901 (2003)

2005-02-04

arxiv.org/abs/quant-ph/0502032v1

Phys. Rev. Lett. 94, 048901(2005)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.94.048901

In a recent letter, Barbosa et al [PRL 90, 227901(2003)] claim that secure
communication is possible with bright coherent pulses, by using quantum noise
to hide the data from an eavesdropper. We show here that the secrecy in the
scheme of Barbosa et al is unrelated to quantum noise, but rather derives from
the secret key that sender and receiver share beforehand.

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