[anoncoder]

The main reason I felt Scott A. (and company) lost the debate is because he could not point to a single experiment that actually uses qubits to do a calculation above a very small threshold. There is much written about experiments that seem to show entanglement of multi qubit systems, but none of them actually do any calculations with the qubits.

Brady and Anderson's point is that it's not a qubit until you can calculate with it. And their theory suggests it will get exponentially harder for each qubit above 4 (I think), which throws out all of the interesting quantum algorithms.

I also felt Brady and Anderson silenced every objection. After one or more of their rebuttals, they were no longer challenged. The most recent post about Feynman is also interesting.

In any event, it is a fascinating blog post.