Quantum logic gates based on coherent electron transport in quantum wires

It is shown that the universal set of quantum logic gates can be realized u sing solid-state quantum bits based on coherent electron transport in quant um wires. The elementary quantum bits are realized with a proper design of two quantum wires coupled through a potential barrier Numerical simulations show that (a) a proper design of the coupling barrier allows one to realiz e any one-qbit rotation and (b) Coulomb interaction between two qbits of th is kind allows the implementation of the CNOT gate. These systems are based on a mature technology and seem to be integrable with conventional electro nics.