Numerical simulation of quantum logic gates based on quantum wires

Quantum theory of computation has been rapidly developed in the recent years. Still it seems very difficult to find a quantum system suitable for realization of the fundamental logic gates, technologically feasible and easily integrable into traditional circuitry. We propose a system based on frontier mesoscopic semiconductor technology. The elementary quantum bit (qbit) is defined as the state of an electron running along a couple of quantum wires coupled through a potential barrier with variable height and/or width. In this work we show that a proper design of the system, together with the action of Coulomb mutual interaction of two electrons representing two different qbits, allows the implementation of basic one-qbit and two-qbit quantum logic gates. Numerical simulations confirm the correctness of the hypothesis.