Gates for the Kane quantum computer in the presence of dephasing

Abstract

The effect of dephasing quantum states for the solid-state Kane quantum computing architecture was investigated using a model of decoherence. It was found that the errors of typical rates of dephasing were close to the error threshold required for fault tolerant quantum computations. Nonadiabatic schemes were used to construct CNOT gates it in a single pulse sequence. The adiabatic CNOT operation was required to be applied up to three times to create an arbitrary two qubit gate directely.