Quantum Science

Quantum mechanics  :
(QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantumfield theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.

USE :
Today, the most precise clocks in the world, atomic clocks, are able to use principles of quantum theory to measure time. They monitor the specific radiation frequency needed to make electrons jump between energy levels.

LAW :
The new theory ignored the fact that electrons are particles and treated them as waves. By 1926 physicists had developed the laws of quantum mechanics, also called wave mechanics, to explain atomic and subatomic phenomena.