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 |
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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. |