Staff（白井 正文）教授図１. ダイヤモンド中の不純物欠陥（NV中心）を用いた無偏光単一光子発生。Fig.1 Schematic picture of unpolarized single-photon generation using a com-pound defect, a nitrogen vacancy center (NV center), in a diamond. Spheres, designated N and V respectively, indicate a nitrogen atom and a vacancy which comprises an NV center in the diamond lattice. Dynamically and statically unpolarized single-photon emission is induced by laser exci-tation for a [111]-oriented NV center in (111) diamond.現在の情報処理・通信技術は、信号を電圧や周波数などの古典的でマクロな物理量に対応させて様々な処理を行っているが、近い将来、情報の高密度化と高速化に限界が訪れることが指摘されている。これに対し、個々の電子や光子などのミクロな量に情報を保持させ、量子力学の原理を直接応用することによって、従来の限界を打ち破る性能を持ちうる量子情報通信技術の実用化が強く期待されている。本研究室は、電子および光子を用いた量子情報通信デバイスの実用化を目指し、未来の量子情報通信の中核となるべき極限技術の開発に積極的に挑戦している。量子もつれなどの光の量子性を駆使した量子情報通信技術、新材料・半導体量子構造を用いた量子情報通信デバイス、極限量子計測・制御技術の基礎開発を行っている。Soyoung Baek助教Soyoung BaekAssistant Professor図２. 周波数の量子もつれ光子発生方法の概念図。Fig.2 An illustration of the scheme for producing frequency-entangled photons. A nonlinear crystal has two different poling periods so that produced photon pairs with orthogonally polarized photon pairs can be frequency entangled.43(Masafumi Shirai)Professor Current information and communication technology utilizes macroscopic and classical physical quantities, such as volt-age or frequency of electric fields. The classical technology will reach the limit of information density and speed in the near future. The quantum-mechanical counterpart, “quantum information processing and communication technology”, in which information is carried by microscopic and quantum-me-chanical quantities, is expected to overcome the difficulty. Our goal is to develop quantum information devices utilizing quan-tum interaction between electrons and photons in semicon-ductor nanostructures, to obtain further understanding of their physics, and to apply them to practical quantum information technologies.Development of fundamental devices and quantum measure-ment techniques for quantum info-communication technology (QICT) utilizing photons, novel materials and semiconductor nanostructures.Research ActivitiesQuantum-Optical Information Systems(Assistant Prof. Soyoung Baek)量子光情報工学研究室Quantum-Optical Information Technology研究活動量子光情報システム研究分野｜Soyoung Baek助教
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