Study on superradiance using solid-sate microcavity coupled with single light emitters

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K03686
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Kyoto University
• Principal Investigator: Takashima Hidaki 京都大学, 工学研究科, 助教 (00432162)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ナノ光ファイバ / ダイヤモンド / 窒素欠陥中心

Outline of Final Research Achievements

In recent years, to realize quantum applications such as quantum computers and quantum measurement, it is expected to realize a multiphoton entangled photon source. Toward the realization of this photon source, in this study, we have developed nanofiber Bragg cavities (NFBCs) using helium ion microscope and measured optical properties of nitrogen vacancy centers (NVCs) at low temperature.
As a result, we succeeded in the development of a NFBC with high quality factor improved by 16 times or more compared to the NFBC fabricated by Gallium type focused ion beam. We have also discovered NV centers, which have shorter emission lifetime than usual.

Free Research Field

量子光学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発された高Q値NFBCに単一発光体を結合させたハイブリッドデバイスを開発すると、量子暗号通信や光子を用いた量子コンピューターなどの実現に不可欠な高効率単一光子源の実現が期待できる。また、本研究で得られたシリコン欠陥中心内包極微ナノダイヤモンドは、単一光子源などへの応用に加え、近赤外域での新しいバイオマーカーやナノスケールの温度センサーなどへも応用できうる。これらのことから、本研究成果は、量子科学からライフサイエンスまで幅広い研究分野に影響を与えうる成果だと考えられる。