Classical and Quantum Measurement Theory

TL;DR

This paper proposes a unified measurement theory that incorporates noncommutativity and quantum noise into classical measurement theory, bridging the gap between classical and quantum measurement frameworks and aiding the unification of physics theories.

Contribution

It introduces a framework where classical and quantum measurement theories are unified through noncommutativity and quantum noise, enabling a single comprehensive measurement theory.

Findings

Classical measurement theory extended with noncommutativity.

Quantum noise modeled via Poincaré invariance.

Unified measurement theory applicable to geometry in physics.

Abstract

Classical and quantum measurement theories are usually held to be different because the algebra of classical measurements is commutative, however the Poisson bracket allows noncommutativity to be added naturally. After we introduce noncommutativity into classical measurement theory, we can also add quantum noise, differentiated from thermal noise by Poincar\'e invariance. With these two changes, the extended classical and quantum measurement theories are equally capable, so we may speak of a single "measurement theory". The reconciliation of general relativity and quantum theory has been long delayed because classical and quantum systems have been thought to be very different, however this unification allows us to discuss a unified measurement theory for geometry in physics.