Twenty years ago, theoretical physicists and computer scientists were developing quantum algorithms for virtual quantum computers, with no working hardware in sight. Today, just about anyone can log ...

The original version of this story appeared in Quanta Magazine. One July afternoon in 2024, Ryan Williams set out to prove himself wrong. Two months had passed since he’d hit upon a startling ...

Google has been challenged by an algorithm that could solve a problem faster than its Sycamore quantum computer, which it used in 2019 to claim the first example of “quantum supremacy” – the point at ...