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Abstract

In this talk we will discuss recent results in quantum bus (Qubus) computation involving controlled rotations. We begin by presenting a scheme to measure the syndromes for any stabilizer quantum error correcting code using just one coherent probe beam and optical displacements. By allowing additional coherent probe beams we can generalise this to a fault tolerant scheme.

Next, we present a scheme to perform a Toffoli gate using a single coherent probe beam and optical displacements that succeeds 1/4 of the time. This gate can be generalised to an n-qubit Toffoli gate that also succeeds 1/4 of the time. We next present a method to perform computation between coherent state type logic that is the most resource efficient to date.

Finally, we present a scheme to efficiently generate large GHZ states that can be used for cluster state computation.