Realizations of Quantum Computers

Md. Mehedi Hasan

Ternary quantum computing technology is a promising technology for future computer systems. In any computer system, an adder circuit is an essential circuit that performs arithmetic and logic operation of the computer. So, for the ternary quantum computer system, an efficient and low-cost realization of ternary adder is very necessary. This paper introduces a novel realization of quantum ternary adder which reduces the realization cost extensively compared to the previous realization.

Mingsheng Ying

Hans A. De Raedt, Kristel F. L. Michielsen, Anthony Hams +2 more

We study effects of the physical realization of quantum computers on their logical operation. Through simulation of physical models of quantum computer hardware, we analyze the difficulties that are encountered in programming physical realizations of quantum computers. Examples of logically identical implementations of the controlled-NOT operation and Grover's database search algorithm are used to demonstrate that the results of a quantum computation are unstable with respect to the physical realization of the quantum computer. We discuss the origin of these instabilities and discuss possibilities to overcome this, for practical purposes, fundamental limitation of quantum computers.

V. G. Plekhanov

Peter P. Rohde

Minoru Fujishima

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.