Development for practical application

QunaSys is developing software for practical application of quantum computers.

Today's quantum computers are still under development, and it will take some more time before they can be widely used. In preparation for future practical applications, we are working on software development that will enable quantum computer users to easily utilize the power of quantum computing.

Collaboration research with users

QunaSys values user interaction in order to advance the practical application of quantum computers.

Seeking to determine where quantum computers fit into specific industrial issues, we engage in dialogue with user firms and academia, which bring extensive domain-specific knowledge to the table. Through collaboration research we will overcome obstacles to the practical application of quantum computers.

Creating a quantum computer ecosystem

QunaSys aims to bring quantum computing to society.

In order for quantum computers to be utilized, we need many more users to understand this technology, enable the advanced integration of hardware and software to maximize its power. QunaSys is helping quantum computing industry shape its vision and co-creat this new industry.


A quantum chemical calculating cloud service for quantum computers - translates the user friendly input of the chemistry calculation to state of the art quantum algorithms.



Specializing in quantum chemistry calculations

Qamuy supports quantum chemistry calculations on a quantum computer simmilar to the conventional quantum chemistry softwares.

Qamuy supports the calculations of physical properties needed for quantum chemistry such as;

Energy, Energy derivative, Dipole moment, Oscillator strength, Non-adiabatic coupling, Vibrational analysis, Band structure, Geometry optimization

Wide functionality

Qamuy has functions that are essential when executing a quantum chemistry calculation on a quantum computer.


  • Quantum algorithm
  • Quantum circuit simulation
  • Optimization of quantum circuit
  • Running on real quantum computers
  • Performance analyzation

No need of expertise in Quantum

Qamuy translates the input of the quantum chemistry calculation into quantum algorithm, meaning you don't need knowledge of quantum algorithms to process the computation on the quantum computer.

Research collaboration

Basic methods for quantum chemical calculations
Partnership with JSR

In this joint research, we are developing basic methods for utilizing quantum computers for quantum chemical calculations and materials development, with the anticipation that a quantum computer of practical size and accuracy will be realized within a few years. Thus far, we have developed algorithms for more performant quantum chemical calculations (orbital optimized unitary-coupled cluster, OO-UCC)*1 and an algorithm for calculating energy in periodic systems*2, with these results being published in scientific journals.

※1: Physical. Review Research 2, 033421 (2020)
※2: Physical. Review Research 4, 013052 (2021)

Frequency analysis of the molecular vibrations
Partnership with ENEOS

Frequency analysis of the molecular vibrations is a fundamental method of chemical analysis, and is used as a spectrum of evaluating the mechanism of chemical reactions.

It especially holds a prominent position among the energy field, such as analyzing catalytic reactions of petroleum refinement and Hydrogen production, and reaction analysis of oil additive from lubricant oils.

However, frequency analysis were difficult to process on classic computers and were behind on industrial application. The ENEOS Group and QunaSys has collaborated to approach this challenge by working on the development of quantum algorithms, and verified on the actual Honeywell quantum computer.

Microsoft Azure Quantum Blog

Quantum dynamics simulation
Partnership with TOYOTA CENTRAL R&D LABS., INC.

Quantum dynamics simulations are a method that allow for more accurately describing natural phenomena by taking into account the quantum effects of nuclei and non-adiabatic effects, which are couplings between electrons and nuclei.

In this joint research, we are working on the development of algorithms for realizing quantum dynamics simulations on quantum computers. When the scale and accuracy of real quantum computers improves in the future, we are able to use the algorithms developed in this joint research to design functional materials that can handle non-adiabatic effects, something difficult to incorporate thus far. This is expected to change the way materials design works, particularly in areas such functional optical materials and catalyst design.

QPARC / A consortium for businesses using quantum computers

"QPARC" is a consortium for businesses that are actively using quantum computers.

It provides lectures as well as programming exercises to deepen the participants' knowledge of quantum computing hardware and algorithms. It also works on discovery of indestrial relvant usecases by applying the algorithms we have learned on actual chemistry problems and jointly study how quantum computers can be utilized.

Research grant projects

Cross-ministerial Strategic Innovatation Promotion Program (SIP)
Cabinet Office, Government of Japan

This program focuses on acceleration of the processing speed of softwares

QunaSys is in charge of the interface development for the NISQ and FTQC devices, which is where Qamuy is undergoing development.

Project members;
• Waseda University
• Keio University
• Fixstars Corporation
• QunaSys Inc.

Cross-ministerial Strategic Innovatation Promotion Program (SIP)

The Center of Innovation (COI) program
Ministry of Education, Culture, Sports, Science and Technology

This program focuses on training in the quantum technology field, as well as the development of quantum softwares.

QunaSys supports this by offering knowledge and skillsets on managing consortiums, as well as supporting technology development for the chemistry field of R&D issues.

Project members;
• Osaka University
• TOYOTA TSUSHO Corporation
• QunaSys Inc.

The Center of Innovation (COI) program

Quantum Leap Flagship Program (MEXT Q-LEAP)
Ministry of Education, Culture, Sports, Science and Technology

This is a research and development program geared at achieving the (Quantum leap) by making full use of quantum science and technology (photon and quantum solutions) to solve important economic and social issues.

QunaSys participate as an external business cooperation in two programs working in the field of quantum information processing. The work done there is aimed at hardware development of superconducting quantum computers and quantum software development.

Quantum Leap Flagship Program (MEXT Q-LEAP)

Community Services Runned by QunaSys

Quantum Native Dojo
The beginner’s guide to quantum computing

Quantum Native Dojo is a self-study material for training Quantum Natives, who aspire to be researchers or engineers of the quantum technology.

It covers a wide area including the basic operating principles, algorithms, as well as explanations on how to solve more advanced chemical and financial calculations.

Quantum Native Dojo

Quantum Circuit Simulator

Qulacs is a high-speed Quantum Circuit Simulator for Quantum computing research. It balances its high-speed process and practicality by implementing the library written in C++ through an interface in Python.

Simulations on classical computers are essential for algorithm development on quantum computers. QuanSys uses Qulacs for our algorithm developments.

Qulacs was developed at the Fujii Laboratory in Osaka University, and QunaSys supports the maintenance and developing new features. We are open to people interested in joining the Qulacs community through its Community Slack, R&D using Qulacs, and proposals of new features for Qulacs on GitHub.

Qulacs: Github

Qulacs: Documentation

Qulacs: Slack channel

Benchmarking website for quantum algorithms

Quantaggle is a site with the benchmark results that were consolidated based on standardized statistical data sets.

In order to devlop a faster, higher accuracy quantum chemical calculation, we need to examine the combinations of these algorithms, and Quantaggle can help.


Quantaggle: data set

QunaSys Tech Blog
Quantum computing technology blog

Blogs about quantum algorithm developments written by QunaSys engineer and researchers.

QunaSys Tech Blog