A quantum computer has been the focus of considerable attention since it realizes a much higher operating speed than conventional computers. However, there are many important issues regarding algorithms as well as hardware in the realization of a quantum computer. To realize the calculation speed of a quantum computer, several quantum-computing emulators utilizing parallel operation using integrated circuits were fabricated. Consequently, an emulator of 75 quantum bits was realized, and the feasibility of a high-speed quantum-computing emulator using integrated circuits has been proved.
A quantum computer is highly promising and widely studied since it enables a much higher calculation speed than current computers. Due to physical limitations, however, the current quantum computer can only solve much smaller scale problems than conventional computers. In order to process a large-scale problem at high speed, we have been studying a quantum computing emulator utilizing semiconductor memories. As a result, we have realized a dedicated processor that solves search problems, such as the satisfiability problem, at much higher speed than current computers. Consequently, without using "quantum process," the possibility of a quantum computer executing a large-scale problem is shown.