I'm just going to give my perspectives and conjectures here. I'm not particularly worried about getting everything right, I'm just presenting a broad theory. If every particle that exists contains quantum information concerning its dynamic material state (Objective) and an abundance of information states left over (Subjective), then there are ways to increase the amount of Subjective states available by reducing the dynamic of Objective states through a variety of ways.
Imagine a very hot, isolated particle in the midst of a star. Its state is very dynamic and unpredictable, and its quantum states are necessarily very full. If we take a very similar particle in a different environment, it will be cooler, and there will be some few states available for Subjective information. If we further make this particle part of a larger system, such that perturbations to the particle will in part be absorbed by the larger system, even further Subjective states will be available. If we make a large, roughly coherent mass of these systems, say electrons/alanine/brain, then the particles and systems have become as stable as they can be at a given temperature -- even body temperature. P:D
Most approaches to quantum computing make use of very low temperatures to minimize the decoherence effects of the surrounding material on a single, isolated particle. Particles decohere their quantum information because of their material relationships to other particles. We can imagine that the perfect (isolated) quantum computing operator would exist at a temperature of absolute zero, would have all of its quantum states occupied by the information we wished it to process, and would essentially cease to exist as a material particle, because there would be no states left over to encode its material relationship to any other particle in our Universe.
1. Heat bath + isolation = decoherence
2. Heat bath + particle relationship = spin-state flip? (a technique currently used to reduce the effects of decoherence)
3. Cold + isolation = less decoherence
4. Cold + particle relationship = very little decoherence
2 allows for clearing the registers for free, while 4 may not allow this 3 takes forever to set up the data input, but does 2 offer any advantage in this regard?
This analysis is based on a methodology of inquiry which takes several dimensions of the problem, and extends them to unusual extremes. By exploring a larger-than-customary problem-space, we sometimes find that certain edges or corners provide us with new comparative perspectives on customary views.
We might call this the Ec-centric Analysis. P:D