| Presentation | 2009-11-03 1-km free-space quantum key distribution experiments between portable optical terminals for space communications(WSANE 2009 (Workshop for Space, Aeronautical and Navigational Electronics)) Morio TOYOSHIMA, Hideki TAKENAKA, Yozo SHOJI, Yoshihisa TAKAYAMA, Masahiro TAKEOKA, Mikio FUJIWARA, Masahide SASAKI, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Quantum cryptography is a new technique for transmitting the information whose security is guaranteed by the laws of physics. In such systems, a single photon is used for the quantum information, however, the transmission distance in the optical fibers is limited by the absorption of photons in an optical fiber in which the maximum demonstrated range is about 140km. Free-space quantum key distribution (QKD) between an optical ground station and a satellite will be a possible solution to extend the distance for the quantum network beyond further than that with optical fibers. The laser communication demonstration between the National Institute of Information and Communications Technology (NICT) optical ground station and a low earth orbit satellite was successfully conducted in 2006. For such space communication links, the free-space quantum cryptography is considered to be an important application in the future. A free-space QKD system was developed in NICT. A prototype system for free-space quantum cryptography with the free-space polarization tracking scheme was developed, and the clock rate of QKD was improved from 20MHz to 100MHz clock rate. 1-km QKD experiment was conducted between two buildings over downtown area in Tokyo. By using the measured parameters, the Decoy state QKD performances aiming for the satellite QKD are examined and the results are presented. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Quantum cryptography / Quantum key distribution / Free-space / Dark count / Sift key / Decoy |
| Paper # | SANE2009-111 |
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| Conference Information | |
| Committee | SANE |
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| Conference Date | 2009/10/26(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Space, Aeronautical and Navigational Electronics (SANE) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | 1-km free-space quantum key distribution experiments between portable optical terminals for space communications(WSANE 2009 (Workshop for Space, Aeronautical and Navigational Electronics)) |
| Sub Title (in English) | |
| Keyword(1) | Quantum cryptography |
| Keyword(2) | Quantum key distribution |
| Keyword(3) | Free-space |
| Keyword(4) | Dark count |
| Keyword(5) | Sift key |
| Keyword(6) | Decoy |
| 1st Author's Name | Morio TOYOSHIMA |
| 1st Author's Affiliation | National Institute of Information and Communications Technology (NICT)() |
| 2nd Author's Name | Hideki TAKENAKA |
| 2nd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 3rd Author's Name | Yozo SHOJI |
| 3rd Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 4th Author's Name | Yoshihisa TAKAYAMA |
| 4th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 5th Author's Name | Masahiro TAKEOKA |
| 5th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 6th Author's Name | Mikio FUJIWARA |
| 6th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| 7th Author's Name | Masahide SASAKI |
| 7th Author's Affiliation | National Institute of Information and Communications Technology (NICT) |
| Date | 2009-11-03 |
| Paper # | SANE2009-111 |
| Volume (vol) | vol.109 |
| Number (no) | 265 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |