Article ID Journal Published Year Pages File Type
422052 Electronic Notes in Theoretical Computer Science 2008 13 Pages PDF
Abstract

We give a technique that can be used to prove that a given function is a measurement. We demonstrate its applicability by using it to resolve three notoriously difficult cases: capacity in information theory, entropy in quantum mechanics and global time in general relativity. We then show that this technique provides a new and surprising characterization of measurement. Thus, in principle, it can always be used.

Related Topics
Physical Sciences and Engineering Computer Science Computational Theory and Mathematics