  We propose a scalable method for implementing linear optics quantum
computation using the ``linked-state'' approach. Our method avoids the
two-dimensional spread of errors occurring in the preparation of the
linked-state. Consequently, a proof is given for the scalability of this
modified linked-state model, and an exact expression for the efficiency of the
method is obtained. Moreover, a considerable improvement in the efficiency,
relative to the original linked-state method, is achieved. The proposed method
is applicable to Nielsen's optical ``cluster-state'' approach as well.
