Quantum physics

The idea that the universe splits into multiple realities with every measurement has become an increasingly popular proposed solution to the mysteries of quantum mechanics. But this “many-worlds interpretation” is incoherent, Philip Ball argues in this adapted excerpt from his new book Beyond Weird.

Oil droplets guided by “pilot waves” have failed to reproduce the results of the quantum double-slit experiment, crushing a century-old dream that there exists a single, concrete reality.

A new theory proposes that the quantum properties of an object extend into an “atmosphere” that surrounds the material.

Computer simulations and custom-built quantum analogues are changing what it means to search for the laws of nature.

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.