On a two-pass scheme without a faraday mirror for free-space relativistic quantum cryptography

  • K. S. Kravtsov
  • I. V. Radchenko
  • A. V. Korol’kov
  • S. P. Kulik
  • S. N. Molotkov
Atoms, Molecules, Optics


The stability of destructive interference independent of the input polarization and the state of a quantum communication channel in fiber optic systems used in quantum cryptography plays a principal role in providing the security of communicated keys. A novel optical scheme is proposed that can be used both in relativistic quantum cryptography for communicating keys in open space and for communicating them over fiber optic lines. The scheme ensures stability of destructive interference and admits simple automatic balancing of a fiber interferometer.


Communication Channel Transfer Matrix Destructive Interference Optical Scheme Quantum Communication Channel 


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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  1. 1.Prokhorov General Physics InstituteRussian Academy of SciencesMoscowRussia
  2. 2.Moscow State UniversityMoscowRussia
  3. 3.Russian FederationAcademy of CryptographyMoscowRussia
  4. 4.Solid State Physics InstituteRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  5. 5.Department of Computational Mathematics and CyberneticsMoscow State UniversityMoscowRussia

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