Our laboratory is conducting research, from a mathematical standpoint, on topics in quantum mechanics, which is a law of physics in the microscopic world. One of the topics of our research is quantum information geometry, a spatial geometry that deals with the state of a micrometer-level particle, which serves as a point (quantum state). It is also a field of mathematics related to quantum mechanics, differential geometry and various other fields. Another topic is quantum computer, which, if its aim is achieved, will result in a computer capable of making such enormous computations as are unimaginable with the existing computers.