Study on time-domain-multiplexed 2D continuous-variable cluster states and its application to large-scale quantum information processing

2022 Fiscal Year Final Research Report

• Project/Area Number: 18H05207
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Furusawa Akira 東京大学, 大学院工学系研究科(工学部), 教授 (90332569)
• Co-Investigator(Kenkyū-buntansha): 青木 隆朗 早稲田大学, 理工学術院, 教授 (10343146) ; 高橋 浩之 東京大学, 大学院工学系研究科(工学部), 教授 (70216753)
• Project Period (FY): 2018-04-23 – 2023-03-31
• Keywords: 量子テレポーテーション

Outline of Final Research Achievements

Using the waveguide optical parametric amplifier (waveguide OPA) that we have successfully developed, we succeeded in generating one-dimensional cluster states of 100,000 pulses using 10ns optical pulses. Although we did not achieve two-dimensional due to time constraints, we have established a method for extending one-dimensional clusters to two-dimensional in this project, so we have almost achieved the goal of this project, which was to generate two-dimensional large-scale cluster states of 100x10000 pulses. In addition, p+kx^2 was successfully measured as a nonlinear measurement (A. Sakaguchi et al., arXiv:2210.17120 [quant-ph]). This has enabled general-purpose quantum computations.

Free Research Field

量子テレポーテーション

Academic Significance and Societal Importance of the Research Achievements

本プロジェクトでは、大規模汎用量子計算を可能にする2次元クラスター状態の生成法を確立した。さらに、超高速光通信テクノロジーである5G/6Gテクノロジーを用いた超高速量子計算法を確立した。この結果、従来の量子コンピューターでは、因数分解や組み合わせ最適化問題などの特定の問題しか従来のコンピューターより速く解けなかったが、我々の光量子コンピューターではあらゆる問題を速く解けるようになった。