Improving performance through three key points in quantum computing research by promoting open innovation strategies

Keio University Quantum Computing Center is established on May 2018, and a dynamic and innovative quantum technology ecosystem that strives to create significant societal impact through technological advancements. We connect people in the quantum field and beyond, providing opportunities to learn, collaborate, and achieve more. Our ecosystem is built around four main teams - finance, chemistry, machine learning, quantum optimization – and worked together with companies on-site our campus.

The results of our quantum research key points are 1st "High performance" which requires large-scale logical qubits, 2nd "High quality" which requires low error rates, and 3rd "Stable development platform" which requires continuous improvement of the development environment. Points 1 and 3 fundamentally depend on hardware and software platform providers. Therefore, as our 2nd key focus area, we concentrate on researching new algorithms and collaborating with companies to apply them to their use cases.

Regarding 2nd point, numerous error mitigation techniques exist. By adopting error mitigation software, we achieved several times better results, including depth reduction. We demonstrated energy gap calculations for the one-dimensional Hubbard model on quantum devices using circuits up to 32 qubits.

Finally, we intend to pursue the following research themes as key future directions in quantum computing research, including the relationship between quantum algorithms and their use cases.