Preparation (physics) experienced in quantum mechanics. Preparation (physics) Generally, measuring instruments are meant to get the (pre-)existent value of a physical quantity of a system with as little change of, or interaction with the system as possible. — If a measuring instrument fixes a physical quantity of a physical system for further use (post-existent), then the measurement process is called preparation. For example, a graduated cylinder filled to a definite mark prepares a certain volume of the liquid for further use. Though preparation measures a physical quantity — at least by fixing it — it often destroys previous states of the physical
Interaction information Interaction information The interaction information (McGill 1954), or amounts of information (Hu Kuo Ting, 1962) or co-information (Bell 2003) or information interaction (Licina 2017) is one of several generalizations of the mutual information. In fact, the definition of interaction information is identical to that of multivariate mutual information except for a change in sign in the case of an odd number of random variables except in the work of Licina where information is more like a physical entitiy. Interaction information expresses the amount information (redundancy or synergy) bound up in a set of variables, "beyond" that which is present in