Demonstration of a continuous-variable quantum algorithm on a photonic quantum computer

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H01833
• 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: The University of Tokyo
• Principal Investigator: Shuntaro Takeda 東京大学, 大学院工学系研究科(工学部), 准教授 (80737304)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 量子光学 / 量子情報 / 量子コンピュータ / 連続量量子情報処理 / 量子アルゴリズム

Outline of Final Research Achievements

In recent years, progress has been made in optical quantum computers based on continuous-variable schemes that deal with continuous values, rather than qubit schemes that deal with 0s and 1s. Although the current continuous-variable optical quantum computers are still small-scale and noisy, they can be applied to practical problems if they are utilized properly. Here, we implemented and demonstrated a quantum algorithm for minimizing continuous functions using a small-scale continuous-variable optical quantum computer.

Free Research Field

量子光学

Academic Significance and Societal Importance of the Research Achievements

従来、量子コンピュータを実用的な問題に適用して社会の役に立たせるためには、非常に大規模かつエラーの低いデバイスが実現できる必要があると考えられており、その実現にはかなりの年月が必要と考えられてきた。本研究では、小規模でエラーが多い光量子コンピュータが意味のある計算に適用できることを示し、光量子コンピュータの近未来応用の可能性を示唆する結果となった。