For decades, physicists have talked about quantum distance, a way of measuring how similar or different two quantum states are. In this strange scale, a distance of one means two quantum states are ...

Jim Baggott is a science writer based in Cape Town, South Africa. He is co-author with John Heilbron of Quantum Drama. Quantum mechanics is an extraordinarily successful scientific theory, on which ...

Virtual particles may not be real, but they help physicists track how forces move, and allow for incredibly precise ...

A clever mathematical tool known as virtual particles unlocks the strange and mysterious inner workings of subatomic particles. What happens to these ...