Quantum information theory

Investigations of the simplest possible clocks have revealed their fundamental limitations — as well as insights into the nature of time itself.

Even as mathematicians and computer scientists proved big results in computational complexity, number theory and geometry, computers proved themselves increasingly indispensable in mathematics.

In a landmark series of calculations, physicists have proved that black holes can shed information.

Can we test speculations about how quantum physics affects black holes and the Big Bang?

The laws of physics imply that the passage of time is an illusion. To avoid this conclusion, we might have to rethink the reality of infinitely precise numbers.

Computer scientists established a new boundary on computationally verifiable knowledge. In doing so, they solved major open problems in quantum mechanics and pure mathematics.

A proposal for building wormhole-connected black holes offers a way to probe the paradoxes of quantum information.

Today Google announced that it achieved “quantum supremacy.” Its chief quantum computing rival, IBM, said it hasn’t. The disagreement hinges on what the term really means.

Researchers finally seem to have a quantum computer that can outperform a classical computer. But what does that really mean?