nLab
measurement

Context

Physics

physics, mathematical physics, philosophy of physics

Surveys, textbooks and lecture notes


theory (physics), model (physics)

experiment, measurement, computable physics

Measurement

Idea

In principle, any interaction between two physical systems is a measurement, whereby each system measures the state of the other. In practice, we break the symmetry by treating one system as the real physical system SS of study and the other system as merely a measuring apparatus AA with the sole purpose of measuring SS. If the properties of AA are more directly observable than those of SS, then this is useful.

References

Revised on April 1, 2014 01:19:38 by Urs Schreiber (185.37.147.12)