IIRC in JMS's Squadron Supreme, their Zatanna analogue Arcanna had the ability to manipulate parallel quantum dimensions to achieve the result that she wanted. She also used Schrodinger's Cat as the example of how her power worked.
He used it during his run on Thor, too. Guess it's an idea that really stuck with him, although given the way in which he utilizes it, I'm not sure he understands it. x_x
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