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Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality (Articolo in rivista)

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Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality (Articolo in rivista) (literal)

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Cabello Adan [ 1,2 ] ; D'Ambrosio Vincenzo [ 3 ] ; Nagali Eleonora [ 3 ] ; Sciarrino Fabio [ 3,4 ] (2011)
Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality
in Physical review. A
(literal)

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Cabello Adan [ 1,2 ] ; D'Ambrosio Vincenzo [ 3 ] ; Nagali Eleonora [ 3 ] ; Sciarrino Fabio [ 3,4 ] (literal)

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[ 1 ] Univ Seville, Dept Fis Aplicada 2, E-41012 Seville, Spain [ 2 ] Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden [ 3 ] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy [ 4 ] CNR, INO, I-50125 Florence, Italy (literal)

Titolo

Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality (literal)

Abstract

Quantum cryptographic protocols based on complementarity are not secure against attacks in which complementarity is imitated with classical resources. The Kochen-Specker (KS) theorem provides protection against these attacks, without requiring entanglement or spatially separated composite systems. We analyze the maximum tolerated noise to guarantee the security of a KS-protected cryptographic scheme against these attacks and describe a photonic realization of this scheme using hybrid ququarts defined by the polarization and orbital angular momentum of single photons. (literal)

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