Scientific Results

Hybrid ququart-encoded quantum cryptography protected by Kochen-Specker contextuality

Year: 2011

Authors: Cabello A., D’Ambrosio V., Nagali E., Sciarrino F.

Autors Affiliation: Departamento de Fısica Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain; Department of Physics, Stockholm University, S-10691 Stockholm, Sweden; Dipartimento di Fisica della “Sapienza” Universit`a di Roma, I-00185 Roma, Italy; Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), I-50125 Florence, Italy

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.

Journal/Review: PHYSICAL REVIEW A

Volume: 84 (3)      Pages from: 030302  to: 030302

More Information: We acknowledge helpful discussions with E. Karimi and L. Marrucci. This work was supported by the MICINN Project No. FIS2005-07689, the Wenner-Gren Foundation, FIRB Futuro in Ricerca-HYTEQ, and Project PHORBITECH of the Future and Emerging Technologies (FET) program within the Seventh Framework Programme for Research of the European Commission, under FET-Open Grant No. 255914.
DOI: 10.1103/PhysRevA.84.030302

Citations: 30
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English