The scientific research trend is to use QM as it is. We can't measure certain states and keep them constant because the quantum states are changing too fast. Some mathematical enumerations are possible by using very complex mathematical theories (Quantum Information Theories).
The information scientific overview shows a growing complexity with only some usable structures. We have very complex defined physical values, we have only assumptions and evolving theories.
For using QM for an artificial computer (machine) we need constant values, states and steering elements.
If we see a Quantum Computer as perpetuum mobile we can't find such one. But Quantum Circuits - using single quantum properties - seem to be possible. But they use some complex elements from Mathematics (matrices) and predefined physical gates which are mathematically clear structured.
Is that all - in this complex area or have we to wait for the coming big idea?
What do you think?