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Proceedings Paper

Development of the polarization tracking scheme for free-space quantum cryptography
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Paper Abstract

Quantum cryptography is a new technique for transmitting quantum information. The information is securely transmitted due to the laws of physics. In such systems, the vehicle that transfers quantum information is a single photon. The problem with using photons is that the transmission distance is limited by the absorption of the photons by the optical fiber along which they pass. The maximum demonstrated range so far is approximately 100 km. Using free-space quantum cryptography between a ground station and a satellite is a possible way of sending quantum information farther than is possible with optical fibers. This is because there is no birefringence effect in the atmosphere. However, there is a complication in that the directions of the polarization basis between the transmitter and the receiver must coincide with each other. This polarization changes because the mobile terminals for free-space transmission continuously change their attitudes. If the transmission protocol is based on polarization, it is necessary to compensate for the change in attitude between the mobile terminals. We are developing a scheme to track the polarization basis between the transceivers. The preliminary result is presented.

Paper Details

Date Published: 18 April 2008
PDF: 11 pages
Proc. SPIE 6951, Atmospheric Propagation V, 69510I (18 April 2008); doi: 10.1117/12.783627
Show Author Affiliations
Morio Toyoshima, National Institute of Information and Communications Technology (Japan)
Yoshihisa Takayama, National Institute of Information and Communications Technology (Japan)
Hiroo Kunimori, National Institute of Information and Communications Technology (Japan)
Masahiro Takeoka, National Institute of Information and Communications Technology (Japan)
Mikio Fujiwara, National Institute of Information and Communications Technology (Japan)
Masahide Sasaki, National Institute of Information and Communications Technology (Japan)


Published in SPIE Proceedings Vol. 6951:
Atmospheric Propagation V
G. Charmaine Gilbreath; Linda M. Wasiczko, Editor(s)

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