Quantum Information Physics and Engineering Nakamura-Usami Laboratory
Controlling quantum dynamics in the millimeter world
Quantum mechanics is one of the most fundamental theories in the modern physics and is believed to describe everything from microscopic to macroscopic. On the other hand, we never experience superposition of states, a basic principle in quantum mechanics, in our daily life. However, it has recently been demonstrated that quantum superposition states can be realized not only in microscopic objects such as atoms but also in millimeterscale devices if they are properly prepared, which has stimulated the ideas for novel information processing technologies. Our research focuses on quantum control of collective excitation modes in solids, such as electromagnetic excitation in superconducting circuits, spin excitation in ferromagnets, and phonon excitation in crystals. We also aim at its applications to quantum information science.
Transfer quantum states between optical and microwave signals
Superconducting quantum bits realized in superconducting circuits process information while interacting with microwave photons. On the other hand, optical fiber communications for remote quantum information transfer exploit infrared photons. Energies of microwave and infrared photons differ from each other by fourorders of magnitude, which makes interfacing quantum information challenging. Our research targets are to develop technologies for the goal as well as for quantum computing based on collective excitations in solids. With that, we hope to extend the framework of quantum information science.
Specialized field：Quantum information science, Condensed matter physics, Superconductivity
Specialized field：Quantum optics