Quantum information processing device includes resonator incorporating
material containing physical systems, each of physical systems having at
least four energy states, transition between two energy states of at
least four energy states, and transition energy between at least two
energy states of at least four energy states, at least four energy states
being non-degenerate when magnetic field fails to be applied to physical
systems, transition resonating in resonator mode that is in common
between physical systems, each of at least four energy states
representing a quantum bit, transition energy being shifted when magnetic
field is applied to physical systems, and magnetic-field application unit
configured to apply magnetic field having direction and intensity to
material, to eliminate linear transition energy shift between two energy
states included in physical systems, each of two energy states included
in physical systems being with excluding two energy states resonating in
resonator mode.