Comunicações Quânticas com Segurança Incondicional via Subspaços Livres de Descoerência (Unconditionally Secure Quantum Communications via Decoherence-Free Subspaces)

Elloá B. Guedes (, Francisco Marcos Assis (

1Universidade do Estado do Amazonas
2Universidade Federal de Campina Grande

This paper appears in: Revista IEEE América Latina

Publication Date: June 2015
Volume: 13,   Issue: 6 
ISSN: 1548-0992

We show how to use decoherence-free subspaces over collective-noise quantum channels to convey classical information in perfect secrecy. We argue that codes defined over decoherence-free subspaces are codes for quantum wiretap channels in which the gain of information by a non-authorized third part is zero. We also show that if some symmetry conditions are guaranteed, the maximum rate on which such secret communications take place is equal to the ordinary capacity of a quantum channel to convey classical information. As a consequence of these results, we show how some protocols for secure communication can be simplified, reducing significantly the number of communications performed.

Index Terms:
Decoherence-free subspaces, Quantum wiretap channels, Unconditional Security.   

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