uncertainty principle

To the chagrin of many physicists, the Heisenberg uncertainty principle determines that one cannot simultaneously know a signal's position and momentum, or voltage and current, with accuracy.

Quantum theory tells us that particles obey Heisenberg's uncertainty principle, and we can never know their position or velocity at the same time.

This is because of an idea in quantum physics called Heisenberg's uncertainty principle.

All these applications are based on the counterintuitive features of quantum theory, such as superpositions, entanglement and the uncertainty principle, which are also part of real quantum theory.

And putting an observer in an exam room would create the medical version of the uncertainty principle: “Once an observer is in there everyone’s behavior will subtly change,” he said.