Philip Ball looks at how a little-known paper by Niels Bohr demonstrates the turmoil in physics on the brink of quantum ...

Today, it might be turning your computer off and on again. Quantum mechanics — the most successful and important theory in modern physics — is like that. It works wonderfully, explaining ...

The old approach proposed by Franck and Teller ... In the new approach proposed by Egorov and based on a new fundamental physical theory—quantum‒classical mechanics, which takes into account ...

Quantum field theory marries the ideas of other quantum theories to depict all particles as “excitations” that arise in underlying fields. The British physicist Paul Dirac started the ball ...

That light can be both particles and waves is one of the most illogical—but at the same time fundamental—characteristics of quantum mechanics. This is called wave-particle duality. The theory ...