Quantum physics

A quickly closed loophole has proved that the “great smoky dragon” of quantum mechanics may forever elude capture.

Recent experiments have put relatively large objects into quantum states, illuminating the processes by which the ordinary world emerges out of the quantum one.

A recent experiment shows how quantum mechanics can make heat flow from a cold body to a hot one, an apparent (though not real) violation of the second law of thermodynamics.

The renowned British physicist, who died at 76, left behind a riddle that could eventually lead his successors to the theory of quantum gravity.

A recently proposed experiment would confirm that gravity is a quantum force.

Two teams of physicists have created the "Higgs mode" – a link between particle physics and the physics of matter. The work could help researchers understand the strange behavior of deeply quantum systems.

A complete classification could lead to a wealth of new materials and technologies. But some exotic phases continue to resist understanding.

Physicists are trying to rewrite the axioms of quantum theory from scratch in an effort to understand what it all means. The problem? They’ve been almost too successful.

Time isn’t just another dimension, argues Tim Maudlin. To make his case, he’s had to reinvent geometry.