New encoding schemes for quantum authentication

Authors:
Priscila García-Fernández;Enrique Fernández-Martínez;Esther Pérez;David J. Santos
Affiliations:
Instituto de Óptica, CSIC, Madrid, Spain;Instituto de Óptica, CSIC, Madrid, Spain;ETSIT, Universidad de Vigo, Vigo, Spain;ETSIT, Universidad de Vigo, Vigo, Spain
Venue:
Quantum Information & Computation
Year:
2005

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Abstract

We study the potential of general quantum operations, Trace-Preserving Completely-Positive Maps (TPCPs), as encoding and decoding mechanisms in quantum authentication protocols. The study shows that these general operations do not offer significant advantage over unitary encodings. We also propose a practical authentication protocol based on the use of two successive unitary encodings.