PHY.9:10 - Architectural Rationale

The measurement relation and the measuring interaction solve connected difficulties. A relation can be derived for a fixed setup that is incapable of resolving the wanted difference. Constructing a different coupling, preparation or reference changes what the relation can supply.

This physical construction links theory to observation and intervention. It also links physical computing to readout: a physical state can carry a computed result that the chosen observation does not distinguish. The mathematical and statistical interpretation remains with the corresponding methods; it receives the interaction and its conditions.