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| Presentation | 2008-02-29 15:15 Study of polarization-tracking scheme for free-space quantum cryptography Morio Toyoshima, Yoshihisa Takayama, Hiroo Kunimori, Masahiro Takeoka, Mikio Fujiwara, Masahide Sasaki (NICT)  SAT2007-70 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | 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. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | quantum cryptography / quantum key distribution / polarization tracking / satellite communication / optical communication / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 107, no. 497, SAT2007-70, pp. 49-54, Feb. 2008. | |
| Paper # | SAT2007-70 | |
| Date of Issue | 2008-02-21 (SAT) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | SAT2007-70 |
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| Conference Information | |
| Committee | SANE SAT |
| Conference Date | 2008-02-28 - 2008-02-29 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kashima Space Research Center (NICT) |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Satellite application and general |
| Paper Information | |
| Registration To | SAT |
| Conference Code | 2008-02-SANE-SAT |
| Language | English (Japanese title is available) |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study of polarization-tracking scheme for free-space quantum cryptography |
| Sub Title (in English) | |
| Keyword(1) | quantum cryptography |
| Keyword(2) | quantum key distribution |
| Keyword(3) | polarization tracking |
| Keyword(4) | satellite communication |
| Keyword(5) | optical communication |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Morio Toyoshima |
| 1st Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 2nd Author's Name | Yoshihisa Takayama |
| 2nd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 3rd Author's Name | Hiroo Kunimori |
| 3rd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 4th Author's Name | Masahiro Takeoka |
| 4th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 5th Author's Name | Mikio Fujiwara |
| 5th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 6th Author's Name | Masahide Sasaki |
| 6th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
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| Speaker | Author-1 |
| Date Time | 2008-02-29 15:15:00 |
| Presentation Time | 25 minutes |
| Registration for | SAT |
| Paper # | SAT2007-70 |
| Volume (vol) | vol.107 |
| Number (no) | no.497 |
| Page | pp.49-54 |
| #Pages | 6 |
| Date of Issue | 2008-02-21 (SAT) |
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