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).

Link:: The Science of Can and Cannot

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