Hiroshi Ueda

Quantum-classical fusion mediated by tensor network

Grant No.：JPMJCR24I1

Research Director

Hiroshi Ueda

Collaborator

Kouichi Okunishi	Professor Graduate School of Science Osaka Metropolitan University
Hidemaro Suwa	Assistant Professor Department of Physics, Graduate School of Science The University of Tokyo

Outline

This research focuses on developing tensor network methods for the quantum-classical hybrid computing era. It involves creating probabilistic tensor network contraction libraries, integrating tensor-network structural search algorithms, and enabling their large-scale parallel computations. Additionally, we aim to advance quantum utility in condensed matter physics by developing quantum algorithms based on these libraries and employing quantum computers.

Franco Nori

Harnessing quantum simulation and machine learning for early fault-tolerant quantum computation

Grant No.：JPMJCR24I2

Research Director

Franco Nori

Collaborator

Yoshitaka Tanimura	Professor Division of Chemistry, Graduate School of Science Kyoto University
Masaki Tezuka	Assistant Professor Division of Physics and Astronomy, Graduate School of Science Kyoto University

Outline

Our goal in this project is to focus on ambitious theoretical research which both takes advantage of small-scale Fault-Tolerant Quantum Computing (FTQC) and prepares the way for efficiently utilized future large-scale FTQC. In pursuance of this goal, we will attempt to answer several open questions in this field, including this question: Can small-scale FTQC be used alongside classical algorithms to simulate the dynamics of complex quantum systems? This project will be particularly focused on developing dynamical simulations which can also operate as dissipative state engineering algorithms, with a focus on applications to complex problems in quantum optics/information/electronics, quantum open systems, quantum chemistry, as well as prospective theories of quantum gravity and other high-energy physics problems.

Yoshimasa Hidaka

Development of New Computational Principles through the Interdisciplinary Integration of High-Energy Physics and Quantum Computing

Grant No.：JPMJCR24I3

Research Director

Yoshimasa Hidaka

Collaborator

Etsuko Itou	Associate Professor Yukawa Institute for Theoretical Physics Kyoto University
Keisuke Fujii	Professor Graduate School of Engineering Science The University of Osaka
Masazumi Honda	Senior Research Scientist iTHEMS RIKEN

Outline

This research aims to formulate and implement quantum gauge theory and quantum gravity in a form that is efficiently executable on quantum computers, through the interdisciplinary integration of high-energy physics and quantum computing. Additionally, we will develop novel quantum error correction codes by utilizing insights from the symmetries and topological properties of gauge theories and quantum gravity. This approach will enable the simulation of nonequilibrium dynamics and finite-density systems, which have been challenging with traditional methods, thereby opening up new frontiers in the integration of quantum computing and high-energy physics.

Shigeru Yamashita

Exploring the Utilization of Fault-Tolerant Quantum Computers by Using Classical Computers Cooperatively

Grant No.：JPMJCR24I4

Research Director

Shigeru Yamashita

Collaborator

Hiroyuki Tomiyama	Professor College of Science and Engineering Ritsumeikan University
Francois Le Gall	Professor Graduate School of Mathematics Nagoya University

Outline

We will develop a computing platform that decomposes a given problem into multiple subproblems, where each subproblem is handled by either a “fault-tolerant quantum computer,” which is expected to be realized in the future, or by a classical computer, depending on their respective strengths. By solving the subproblems that each type of computer excels at, the platform will solve the entire problem efficiently. Furthermore, by utilizing the developed platform, we aim to create new methods for utilizing a fault-tolerant quantum computer that becomes effective only through the cooperative use of both a fault-tolerant quantum computer and a classical computer.

Taro Yamashita

Scalable quantum computer by fusing superconductivity, magnetism, and machinery

Grant No.：JPMJCR24I5

Research Director

Taro Yamashita

Collaborator

Hirotaka Terai	Executive Researcher Advanced ICT Research Institute National Institute of Information and Communications Technology
Atsushi Noguchi	Associate Professor Graduate school of Arts and Sciences The University of Tokyo

Outline

We aim to bring innovation to the scalability of superconducting quantum computers by integrating hybrid quantum/classical technologies of superconductors, magnets, and mechanical oscillators based on nitride superconductors. We develop a new type of superconducting qubits with high performance and scalability, a novel coupler enabling the ultra-fast two-qubit gate, a mechanical quantum memory with a long lifetime, and a broadband quantum amplifier. By combining these technologies, we create fundamental technologies for new scalable quantum computers.

Koji Yoshimura

Frontiers in Space-Time Measurement Pioneered by Nuclear Clocks

Grant No.：JPMJCR24I6

Research Director

Koji Yoshimura

Collaborator

Yoshitaka Kasamatsu	Professor Graduate School of Science The University of Osaka
Atsushi Yamaguchi	Senior Research Scientist Cluster for Pioneering Research RIKEN

Outline

This research aims to develop and apply a nuclear clock using thorium-229, the only nucleus capable of laser excitation. We plan to realize two types of nuclear clocks: the solid-state nuclear clock and the ion-trap nuclear clock, taking advantage of the characteristics of being insensitive to the external field. This will be achieved by uniting and integrating research capabilities from a wide range of fields across Japan. Through this effort, we seek to establish a new quantum measurement technology based on nuclear clocks and pursue innovative applications.