Poet has a patent pending for their version of the SET, which seems to address the major issues highlighted in Disco's article

http://patents.justia.com/patent/20150171197

Excerpt from the Poet patent:

"Advantageously, the SET of the present application allows for realization of electron spin state as a quantum mechanical variable in such a way that the SET is also compatible, in the same technology infrastructure, with conventional state-of-the-art logic circuits. This allows the inputs and outputs from SET quantum computing function to support and take advantage of the existing methodology for high performance computing.