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Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses

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Title: Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses
Authors: Yoshino, Ken-ichiro Browse this author
Fujiwara, Mikio Browse this author
Nakata, Kensuke Browse this author
Sumiya, Tatsuya Browse this author
Sasaki, Toshihiko Browse this author
Takeoka, Masahiro Browse this author
Sasaki, Masahide Browse this author
Tajima, Akio Browse this author
Koashi, Masato Browse this author
Tomita, Akihisa Browse this author →KAKEN DB
Issue Date: 9-Feb-2018
Publisher: Nature Publishing Group
Journal Title: npj Quantum Information
Volume: 4
Start Page: 8
Publisher DOI: 10.1038/s41534-017-0057-8
Abstract: Quantum key distribution (QKD) allows two distant parties to share secret keys with the proven security even in the presence of an eavesdropper with unbounded computational power. Recently, GHz-clock decoy QKD systems have been realized by employing ultrafast optical communication devices. However, security loopholes of high-speed systems have not been fully explored yet. Here we point out a security loophole at the transmitter of the GHz-clock QKD, which is a common problem in high-speed QKD systems using practical band-width limited devices. We experimentally observe the inter-pulse intensity correlation and modulation pattern-dependent intensity deviation in a practical high-speed QKD system. Such correlation violates the assumption of most security theories. We also provide its countermeasure which does not require significant changes of hardware and can generate keys secure over 100 km fiber transmission. Our countermeasure is simple, effective and applicable to wide range of high-speed QKD systems, and thus paves the way to realize ultrafast and security-certified commercial QKD systems.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/68607
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 富田 章久

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