Magic is the butterfly effect. It is a small intentional act upon the initial conditions that has an increasing potency to effect the desired change over longer periods at larger scales upon a chaotic system. Magic is done by manipulating energy at the quantum level. The uncertainty principle leads one to the conclusion that the very act of conscious observation alters a particle(s). The theory purposed by Peter Carrol that particles travel both forward and backward in time may account for much of magical theory such as past lives and divination, even enchantment and spell work. By altering with your conscious intention a particle\particle field you can glean information from past and future, and as is evidenced by successful magic even alter said future through a small act of magic in the present.

I wouldn't really use Heisenburg's Uncertainty Principle as an example of how magic might be quantum. Instead I'd go for quantum entanglement.

Information is a force on matter and energy in the universe that transcends the boundaries of space and time. The mind deals with information, and therefore might interact with existence on an informational level, meshing with the chaos theory in order to produce an effect we describe as 'magical.'

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Of course, basing your magical theories off science is bad business, as science has a tendency to rewrite itself.

Cool 'theory': make results, then tell me about it. Otherwise, what's the point?