ABSTRACT
Solid-state quantum computers promise new information process-
ing functionalities. The challenge of building the two most essential
components of a solid-state quantum computer, a quantum bit
(qubit) and a qubit transport mechanism, can be addressed
with proof-of-principle devices fabricated by controlled single-
ion implantation. One fabrication pathway employs single-ion
implantation to place single-donor atoms with 20 nm precision
in architectures compatible with available fabrication technologies.
Upon measurement, these devices allow control and readout of a
single-donor electron spin. These results, with foreseeable precision
improvements, suggest that controlled ion implantation is a viable
strategy to open the path to a twenty-first-century quantum Internet
based on quantum computation and communication.
