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- [Quantum Software] Year Started : 2021

Researcher

Communication Science Laboratories

NTT Corporation

To implement multipartite secure quantum communication protocols such as the quantum secret sharing and the multipartite quantum communication, which are expected as next-generation quantum information processing technologies as well as a foundation of the large-scale distributed quantum computation, it is desirable to optimize distributed quantum operations and quantum entanglement between communication nodes. In this research, I establish versatile methods for optimizing the distributed quantum operations and for verifying and minimizing the sharing cost of quantum entanglement taking advantage of the characteristics of the protocols, which would be theoretical foundations for the implementation of various multipartite secure quantum communication protocols.

PRESTO Researcher, Japan Science and Technology Agency

Wavefunctions of quantum many-body systems originally contain various information that determines their physical properties, but it is very difficult for classical computers to calculate all of them. In this project, I will construct a technical basis for analyzing the wavefunction of a quantum many-body system using a commercial quantum computer and a GPU simulator. I also aim to use this technology to solve unsolved problems in condensed matter physics and quantum statistical physics.

Associate Professor

Yukawa Institute for Theoretical Physics

Kyoto University

I will develop quantum computation algorithms for simulating field theories that describe the physics of elementary particles. I will implement several classical-quantum hybrid calculation methods and verify which method is effective. I will also apply these methods to clarify the properties of systems with the sign problem, which are difficult to simulate with conventional Monte Carlo method. The basic codes will open to the public and will be useful for particle and nuclear theoriests.

Associate distinguished researcher

NTT computer&data science laboratory

Nippon Telegraph and Telephone Corporation

Recently, quantum error mitigation, a technique for compensating for computational errors in quantum computers, has been actively studied. In this research, I give a unified definition to the various quantum error mitigation techniques that have been discovered. Then, by combining the quantum error mitigation techniques, I propose a highly practical quantum error mitigation technique that is efficient and can cope with complicated noise. I also study an efficient fault-tolerant quantum computing architecture that incorporates quantum error mitigation.

Associate Professor

Graduate School of Engieering

Nagoya University

We develop an interface program connecting density funcitonal theory with quantum eigen solver to apply quantum algorithms to realistic and large systems such as a solute molecule in water and a molecule adsorbing on surfaces. To include the effects of the environment, we construct an effective Hamiltonian for the variational quantum eigensolver using embedded potentials. In addition to the calculations of energies, we also perform first-principles molecular dynamics simulations using the variational quantum eigensolver and compute physical quantities at the coupled-cluster level.

RIKEN Hakubi Team Leader

RIKEN Center for Quantum Computing

RIKEN

A research field called Hamiltonian complexity is currently developing e the computational complexity of quantum many-body systems. Hamiltonian complexity has attracted a great deal of attention for the proof of quantum supremacy and the development of quantum algorithms with efficiency guarantees. This research field is an interdisciplinary research area between computer science and physics, where various unsolved problems are defined in a mathematically precise way. My research aim is to solve these mathematically unsolved problems.

Senior Research Scientist

iTHEMS

RIKEN

At the beginning of the universe, what was really going on? To answer this question, we need to understand the physical law governing the early universe and study its time evolution. This task is known to require a huge computational cost if we use conventional technology. In this research, I aim to develop and establish quantum algorithms to overcome this situation by quantum computation.

Associate Professor

College of Humanities and Sciences

Nihon University

Detecting the quantum state of artificial quantum systems and the quantum entanglement existing in it is a key issue for quantum computing and simulations. This project aims to develop quantum state reconstruction method and quantum entanglement detection with an efficient algorithm at a realistic cost, assuming ultracold atoms trapped in an optical lattice as an example of artificial quantum systems. After the implementation tests on the cold atom quantum simulators, the constructed method will be intended to be applied to other artificial quantum systems.

Research Associate

Graduate School of Engineering

The University of Tokyo

Drastic advancements in quantum information technology are bringing us closer to an era in which large-scale quantum computing is within reach. However, we have not fully explored the techniques to make the most of quantum resources without fault tolerance. In this project, we aim to establish a theoretical framework that pushes the boundaries of feasible high-precision operations, relying on a novel notion of “quantum parallel circuits.” We explore how to enhance the computational capacity by controlling quantum correlations between independently executed quantum circuits and classical post-processing technologies.

Associate Professor

Faculty of Engineering

Shibaura Institute of Technology

Obtaining the solution of combinatorial optimization problems is an important current issue for sustainable society. Quantum annealing is a unique method to solve this problem by using quantum effects, although it is also known to have issues and is currently being studied extensively and intensively. In my research project, we develop a method of realizing a quantum computer for imaginary-time quantum annealing as a new solver for combinatorial optimization problems. We will further develop efficiency improvement methods and develop the Imaginary Time Quantum Toolbox, which incorporates these methods.