In one embodiment, a quantum detector is provided to detect a vulnerability measure for a processor based on a processor metrics each associated with operation of a processor structure during a quantum, along with a controller to control an error mitigation unit based on the vulnerability measure. The first electrode can extend from the chip carrier part toward a perimeter of the casing, and the second electrode can extend away from the chip carrier part and projects outside of the casing. Eight flat plate-shaped magnets on the mounting surfaces for providing a magnetic field are arranged to face the outside surface portions of the coil through a predetermined constant spacing.