Karmela Padavic-Callaghan

There have been several claims of quantum computers performing at a level impossible to match with a classical computer – most of which have been refuted. Could there be a mathematical reason why this keeps happening?

Schrödinger called his metaphorical cat “quite ridiculous” but the quantum weirdness it represents has become a useful benchmark for the quantum computing industry, finds our quantum columnist Karmela Padavic-Callaghan

The US Defense Advanced Research Projects Agency (DARPA) wants to know which of the quantum computers now in development have the best chance of being game-changing technologies

As quantum computers mature, they will be transformational. But there are good reasons why we don’t yet know exactly which problems they will excel at – and that makes them all the more exciting

It is rare to find brown dwarf stars orbiting in pairs, and this pair has an even more unusual exoplanet companion

Two independent research teams have developed methods for hacking noisy quantum computers based on a row-hammer attack, a type of interference used to infiltrate traditional computers

Researchers at the Large Hadron Collider found evidence of an unprecedentedly heavy and exotic form of antimatter in the aftermath of a collision between extremely fast lead ions

Machine learning helped show how harnessing the weird effects of Einstein’s special relativity could enable a new kind of quantum computer – and it could also create new insights into the quantum realm

Two commercial telecommunications facilities have been connected by a secure quantum network that used existing fibre optic cables at room temperature – a key step towards a feasible quantum internet

One of the most famous findings in physics could be wrong – the double-slit experiment was long thought to confirm that light can be a wave, but its results can be fully explained using only quantum particles