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Proceedings Paper

Experimental quantum cryptography scheme based on orthogonal states: preliminary results
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Paper Abstract

Since, in general, non-orthogonal states cannot be cloned, any eavesdropping attempt in a Quantum Communication scheme using non-orthogonal states as carriers of information introduces some errors in the transmission, leading to the possibility of detecting the spy. Usually, orthogonal states are not used in Quantum Cryptography schemes since they can be faithfully cloned without altering the transmitted data. Nevertheless, L. Goldberg and L. Vaidman [Phys. Rev. Lett. 75 (7), pp. 12391243, 1995] proposed a protocol in which, even if the data exchange is realized using two orthogonal states, any attempt to eavesdrop is detectable by the legal users. In this scheme the orthogonal states are superpositions of two localized wave packets which travel along separate channels, i.e. two different paths inside a balanced Mach-Zehnder interferometer. Here we present an experiment realizing this scheme.

Paper Details

Date Published: 16 April 2010
PDF: 5 pages
Proc. SPIE 7702, Quantum Information and Computation VIII, 77020E (16 April 2010); doi: 10.1117/12.848778
Show Author Affiliations
Alessio Avella, Istituto Nazionale di Ricerca Metrologica (Italy)
Giorgio Brida, Istituto Nazionale di Ricerca Metrologica (Italy)
Ivo Pietro Degiovanni, Istituto Nazionale di Ricerca Metrologica (Italy)
Marco Genovese, Istituto Nazionale di Ricerca Metrologica (Italy)
Marco Gramegna, Istituto Nazionale di Ricerca Metrologica (Italy)
Paolo Traina, Istituto Nazionale di Ricerca Metrologica (Italy)

Published in SPIE Proceedings Vol. 7702:
Quantum Information and Computation VIII
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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