Quantum Computer Brains
As shown in World Superposition, the world of each individual is the superposed sum of all the worlds in which the world hologram exists. As described in Identity, this means even the body-mind itself is indeterminate except where observed. On the inside view, this is the reality of all possible body-minds that are seeing these things and having these thoughts, and holding these memories. This is the experience of all of them simultaneously. The result is that the brain is effectively a quantum computer because all possible variations of thinking and appraisal in the unconscious are being utilised, all at once.
In order to illustrate what this means it is useful to start with the leading-edge concept of mind by Daniel Dennett (1991): the multiple drafts concept. According to this, the mind is constantly producing many trains of thought, all in parallel, although there is conscious awareness of only one of them. Each train of thought is like a draft, a seed idea, the beginning of the way thinking could go. When one such draft is noticed, and the train of thought followed consciously, this becomes the content of awareness: the train of thought one is actually aware of.
Dennett’s concept fits very well with our knowledge of the structure of the brain, which is known to work as a massively-parallel, distributed processor in which a vast amount of computation is taking place simultaneously. His idea is exactly what one would expect in a system of this nature. There are many different trains of thought going on, any of which may surface to conscious awareness. When we apply this concept in the indeterminate world we get something highly remarkable. Every possible draft is going on. This is the reality of all possible body-minds having a specific conscious train of thought. This is the superposition of all of them. Therefore all possible drafts are also present. So at the unconscious, creative stage, you have all possible trains of thought available.
This means that effectively the brain works as a quantum computer. A quantum computer is one that utilises all possible variations of a program to reach a specific result. And this is not just a play on words. A quantum computer works because the physical substrate is in a state of all possible states. Since the brain you are actually using is the superposition of all possible brains in which you exist, it is therefore quite literally a quantum computer. It is performing an unlimited variety of drafts simultaneously. No wonder we can be so creative. Every possible solution to a problem is looked at in some version of the mind. Every possible form of an art work being formed is flirted with. Every possible way of looking at things is in there somewhere.
Incidentally, it is important to realise the brain is not a quantum computer in any ordinary sense. This possibility has been raised a number of times. It has been looked at as a possible explanation of the quantum weirdness, and also the phenomenon of consciousness. However, as Tegmark (1999) makes absolutely clear in his article in Physics Review, such a phenomenon cannot be taking place. The physical brain in the ordinary objective world does not work as a quantum computer. In the many-worlds reality, however, it cannot not work as a quantum computer.