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Quantum Information Physics and Engineering Nakamura-Usami Laboratory

Manipulate single quanta of collective excitations in solids towards realizations of quantum computers and quantum information networks

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.

Superconducting quantum bit inside a superconducting cavity
Superconducting quantum bit inside a superconducting cavity
Ferromagnetic single-crystalline sphere for single magnon manipulation
Ferromagnetic single-crystalline sphere for single magnon manipulation
Oscillating membrane device for single phonon manipulation
Oscillating membrane device for single phonon manipulation

Member

  • nakamura
  • Specialized field:Quantum information science, Condensed matter physics, Superconductivity
  • usami
  • Specialized field:Quantum optics
Research Associate Yutaka TABUCHI
Research Associate Maria FUWA
<As of May 2019>

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