Several years ago one of us, Toni, asked another of us, Marco, to come to his office at the Institute of Photonic Sciences, a large research center in Castelldefels near Barcelona. “There is a problem ...

A century ago, the strange behavior of atoms and elementary particles led physicists to formulate a new theory of nature. That theory, quantum mechanics, found immediate success, proving its worth ...

Quantum physics is quietly rewriting the rulebook for how far and how fast humanity might travel beyond Earth. A cluster of recent breakthroughs points to a future in which exotic states of matter, ...