Quantum Information Science

JETP Letters

, Volume 96, Issue 5, pp 336-341

First online:

Quantum key distribution on composite photons, polarization qutrits

  • S. P. KulikAffiliated withMoscow State University
  • , S. N. MolotkovAffiliated withMoscow State UniversityAcademy of Cryptography of the Russian FederationInstitute of Solid State Physics, Russian Academy of Sciences
  • , I. V. RadchenkoAffiliated withProkhorov General Physics Institute, Russian Academy of Sciences

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Polarization states of a photon are the most natural degrees of freedom for encoding classical information bits. The two-dimensional space of states associated with polarization degrees of freedom of the photon is insufficient for many problems of information transfer with quantum states. We propose to use the polarization degrees of freedom of composite states of photons (polarization qutrits) for secret cryptographic key distribution.