Line-of-sight quantum key distribution with differential phase shift keying
Free-space optical (FSO) links offer a practical approach to realize quantum key distribution (QKD) in a global scale. However, when one wants to further extend the distance from the geostationary orbit to the ground, currently known QKD schemes cannot realize practical key rates mainly due to the d...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac5056 |
| _version_ | 1797748585880616960 |
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| author | Hiroyuki Endo Toshihiko Sasaki Masahiro Takeoka Mikio Fujiwara Masato Koashi Masahide Sasaki |
| author_facet | Hiroyuki Endo Toshihiko Sasaki Masahiro Takeoka Mikio Fujiwara Masato Koashi Masahide Sasaki |
| author_sort | Hiroyuki Endo |
| collection | DOAJ |
| description | Free-space optical (FSO) links offer a practical approach to realize quantum key distribution (QKD) in a global scale. However, when one wants to further extend the distance from the geostationary orbit to the ground, currently known QKD schemes cannot realize practical key rates mainly due to the diffraction losses of a laser beam. If the facts that the FSO links are highly directional and must be used in the line-of-sight (LoS) condition are taken into account, one may impose some physical restrictions on an eavesdropping model to explore longer-distance QKD. In this paper, we propose a novel FSO secret key agreement scheme, line-of-sight QKD (LoS-QKD), based on a quantum wiretap channel. In our model, an eavesdropper can tap only a limited fraction of the FSO signal beam but perform any physically allowable operations on the tapped signals. Fading effects which are significant in the FSO links are fully taken into account. We provide a security proof for the differential phase shift (DPS) keying scheme in terms of the metric which meets the composability. We investigate numerically the performances of LoS-QKD with DPS keying, including finite-length analysis, showing that our proposed scheme can realize high-speed and long-distance secret key agreement with information-theoretic security. |
| first_indexed | 2024-03-12T16:07:54Z |
| format | Article |
| id | doaj.art-c9de9641f0ae4ddf88b6820f5cd96413 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:07:54Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c9de9641f0ae4ddf88b6820f5cd964132023-08-09T14:18:31ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124202500810.1088/1367-2630/ac5056Line-of-sight quantum key distribution with differential phase shift keyingHiroyuki Endo0Toshihiko Sasaki1https://orcid.org/0000-0003-0745-6791Masahiro Takeoka2Mikio Fujiwara3Masato Koashi4Masahide Sasaki5https://orcid.org/0000-0002-9508-570XQuantum ICT Collaboration Center, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, Japan; Quantum ICT Laboratory, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, JapanDepartment of Applied Physics, The University of Tokyo , Bunkyo-ku, Tokyo 113-8656, Japan; Photon Science Center, The University of Tokyo , Bunkyo-ku, Tokyo 113-8656, JapanFaculty of Science and Technology, Keio University , Yokohama, Kanagawa 223-8522, Japan; Advanced ICT Research Institute , National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795, JapanQuantum ICT Collaboration Center, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, Japan; Quantum ICT Laboratory, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, JapanQuantum ICT Laboratory, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, Japan; Department of Applied Physics, The University of Tokyo , Bunkyo-ku, Tokyo 113-8656, Japan; Photon Science Center, The University of Tokyo , Bunkyo-ku, Tokyo 113-8656, JapanQuantum ICT Collaboration Center, National Institute of Information and Communications Technology , Koganei, Tokyo 184-8795, JapanFree-space optical (FSO) links offer a practical approach to realize quantum key distribution (QKD) in a global scale. However, when one wants to further extend the distance from the geostationary orbit to the ground, currently known QKD schemes cannot realize practical key rates mainly due to the diffraction losses of a laser beam. If the facts that the FSO links are highly directional and must be used in the line-of-sight (LoS) condition are taken into account, one may impose some physical restrictions on an eavesdropping model to explore longer-distance QKD. In this paper, we propose a novel FSO secret key agreement scheme, line-of-sight QKD (LoS-QKD), based on a quantum wiretap channel. In our model, an eavesdropper can tap only a limited fraction of the FSO signal beam but perform any physically allowable operations on the tapped signals. Fading effects which are significant in the FSO links are fully taken into account. We provide a security proof for the differential phase shift (DPS) keying scheme in terms of the metric which meets the composability. We investigate numerically the performances of LoS-QKD with DPS keying, including finite-length analysis, showing that our proposed scheme can realize high-speed and long-distance secret key agreement with information-theoretic security.https://doi.org/10.1088/1367-2630/ac5056quantum key distributionfree-space optical communicationssatellite communicationsphysical-layer cryptography |
| spellingShingle | Hiroyuki Endo Toshihiko Sasaki Masahiro Takeoka Mikio Fujiwara Masato Koashi Masahide Sasaki Line-of-sight quantum key distribution with differential phase shift keying New Journal of Physics quantum key distribution free-space optical communications satellite communications physical-layer cryptography |
| title | Line-of-sight quantum key distribution with differential phase shift keying |
| title_full | Line-of-sight quantum key distribution with differential phase shift keying |
| title_fullStr | Line-of-sight quantum key distribution with differential phase shift keying |
| title_full_unstemmed | Line-of-sight quantum key distribution with differential phase shift keying |
| title_short | Line-of-sight quantum key distribution with differential phase shift keying |
| title_sort | line of sight quantum key distribution with differential phase shift keying |
| topic | quantum key distribution free-space optical communications satellite communications physical-layer cryptography |
| url | https://doi.org/10.1088/1367-2630/ac5056 |
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