  I've been building Powerpoint-based quantum computers with electron spins in
silicon for 20 years. Unfortunately, real-life-based quantum dot quantum
computers are harder to implement. Materials, fabrication, and control
challenges still impede progress. The way to accelerate discovery is to make
and measure more qubits. Here I discuss separating the qubit realization and
testing circuitry from the materials science and on-chip fabrication that will
ultimately be necessary. This approach should allow us, in the shorter term, to
characterize wafers non-invasively for their qubit-relevant properties, to make
small qubit systems on various different materials with little extra cost, and
even to test spin-qubit to superconducting cavity entanglement protocols where
the best possible cavity quality is preserved. Such a testbed can advance the
materials science of semiconductor quantum information devices and enable small
quantum computers. This article may also be useful as a light and light-hearted
introduction to quantum dot spin qubits.
