Repetition of photon generation and manipulation process for deterministic photon-number manipulation and quantum computing

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H01815
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Tohoku University
• Principal Investigator: Kaneda Fumihiro 東北大学, 学際科学フロンティア研究所, 助教 (80822478)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 光子 / 量子情報 / 量子光学

Outline of Final Research Achievements

The scope of the study is to make efficient generation and manipulation of quantum state of light from inefficient processes and components, using repeated process, or time multiplexing. We demonstrated the highest single-photon generation via time-multiplexing technique. Also, we developed a highly pure heralded single-photon source and low-loss, long-life-time optical quantum memories.
Our developed techniques and devices will largely improve the efficiency and precision in generation and manipulation of quantum states of light, and will be key components in large-scale single-photon based quantum computing and arbitrary photon number manipulation.

Free Research Field

量子光学

Academic Significance and Societal Importance of the Research Achievements

本研究では、本質的に低効率であった量子光状態の発生技術を繰り返し実行し、発生効率を増強する仕組みを実証した。特に、量子情報処理における最も基本的な情報担体の一つである、単一光子状態の世界最高効率での発生技術が実証され、さらに疑似決定論的な発生への展望が示された。さらに、単一光子のみならず、より一般的な光子数状態や量子もつれ状態の高効率発生へ向けた基礎技術が実証されており、これらの成果は将来の量子技術の実現に貢献することが期待される。