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

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

2011-09-12

arxiv.org/abs/1109.2508v1

Phys. Rev. A 84, 030302(R) (2011)

Physics

Quantum Physics

REVTeX4-1, 5 pages, 2 figures

Scientific paper

10.1103/PhysRevA.84.030302

Quantum cryptographic protocols based on complementarity are nonsecure 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.

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