For more than a century, modern physics has rested on two towering frameworks that do not quite agree with each other.

A new physics paper takes a step toward creating a long-sought "theory of everything" by uniting gravity with the quantum world. However, the new theory remains far from being proven observationally.

Quantum mechanics is one of the most successful theories in science — and makes much of modern life possible. Technologies ranging from computer chips to medical-imaging machines rely on the ...

The notion that quantum reality is your reality looms as a rich and enticing possibility. Until very recently, the very prospect was all but unthinkable, however. In everyday life there appears to be ...

Quantum mechanics has always carried a quiet tension. At its core, the theory allows particles to exist in many states at ...

Quantum mechanics describes a microscopic world in which particles exist in a superposition of states—being in multiple ...

In an effort to bring together the domains of gravity and quantum theory, Albert Einstein and Nathan Rosen proposed a ...

“This retroactive idea. It has to be that,” says Nobel Prize-winning mathematical physicist Sir Roger Penrose, reflecting on a problem about the building blocks of reality that has dogged physics for ...

D-Wave Quantum's quantum annealing technology has niche limitations, faces competition, and hasn't proven a clear advantage over classical computing. Despite marketing since 2011, D-Wave has a history ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might ...