Counterfactual properties of quantum information
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So here is the main conclusion of this discussion. A quantum information medium is a system with the following counterfactual properties:
It has at least two information variables (such as P and PS) that are impossible to copy simultaneously to arbitrarily high accuracy (non-copiability of information variables).
It must be possible to reverse all the transformations involving these variables (reversibility).
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The science of can and cannot
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