I find this a confusing way to lay out our tag space. Lots of questions (say, this one as a recent example) are about quantum computing as a field, or about some specific aspect of a given quantum computation, without necessarily being about the specific hypothetical objects we call quantum computers.
Generally, tags on this site tend to carry the name of the field of inquiry, not its central object of study: we say fluid-dynamics, not fluids; kinematics, not movement, and so on.
Shouldn't the main tag be quantum-computing?