| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to obtain a high on/off ratio for interaction between two quantum bits in a state in which it hardly suffers an impact from phase relaxation and is applicable to large scale quantum calculation.SOLUTION: In a step S101, an auxiliary quantum bit is made in a state of |-1> by multiplying the auxiliary bit coupling with each of two quantum bits by one quantum bit gate. This operation makes interaction between the two quantum bits on. Next in a step S 102, at a predetermined time after making it in the |-1> state at the first gate operation step, the quantum state of the auxiliary quantum bit is measured in a Y direction. Next in a step S103, on the basis of the measurement result at the measurement at the step S102, the auxiliary quantum bit is made in a state of |-1> by multiplying the auxiliary quantum bit by one quantum bit gate. These operations make interaction between the two quantum bits off. |
