ツジノ ケンジ
  辻野 賢治
   所属   統合教育学修センター 統合教育学修センター
   職種   准教授
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Quantum Receiver beyond the Standard Quantum Limit of Coherent Optical Communication
掲載誌名 正式名:Physical review letters
略  称:Phys Rev Lett
ISSNコード:00319007
巻・号・頁 106,pp.250503
著者・共著者 Kenji Tsujino†, Daiji Fukuda, Go Fujii, Shuichiro Inoue, Mikio Fujiwara, Masahiro Takeoka, Masahide Sasaki
担当区分 筆頭著者
発行年月 2011/06
概要 The most efficient modern optical communication is known as coherent communication, and its standard quantum limit is almost reachable with current technology. Though it has been predicted for a long time that this standard quantum limit could be overcome via quantum mechanically optimized receivers, such a performance has not been experimentally realized so far. Here we demonstrate the first unconditional evidence surpassing the standard quantum limit of coherent optical communication. We implement a quantum receiver with a simple linear optics configuration and achieve more than 90% of the total detection efficiency of the system. Such an efficient quantum receiver will provide a new way of extending the distance of amplification-free channels, as well as of realizing quantum information protocols based on coherent states and the loophole-free test of quantum mechanics.