We have found a lot of particles of QM (Leptons, Quarks and Bosons). All have different properties like spin, charge, mass, speed, wave polarisation, frequency and so on).
Which of these properties may be interesting for a predictable, steerable Quantum Computer?
Which one of the four forces may be used?
The basic property of a computer is his action in steps or little states. These can be observed and steered automatically by programms or in single cases direct by human.
The problem of Quantum Information Theory is that it uses superpositions of all states. This superposition is based on physically properties of f. i. an atom: kernel with protons, neutrons and surrounding electrons with sometimes excited photons. All these particles have their own properties (energy level, spin, charge, mass, polarisation). So in real nature we have a complex Quantum System which we can understand or imagine by our Quantum Mechanical Theory not definitly till now.
I ask my question because I suppose we never can rebuild a system like it is in our physical quantum world.
So we need a physically reduction to single quantum particles with single properties.
We go this way by developing our Quantum Circuits. Perhaps we will find an Artificial Quantum Element which can realize our Quantum Information Theory - like a transistor did in early classical Informatics. Perhaps we never will find one which is typically and common usable as Quantum Computer Element.
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