  By removing a $^{12}C$ atom from the tetrahedral configuration of the
diamond, replace it by a $^{13}C$ atom, and repeating this in a linear
direction, it is possible to have a linear chain of nuclear spins one half and
to build a solid state quantum computer. One qubit rotation and controlled-not
(CNOT) quantum gates are obtained immediately from this configuration, and CNOT
quantum gate is used to determined the design parameters of this quantum
computer.
