A photon was apparently detected in two places at once in a twist on the classic double-slit experiment, but many physicists ...

“This retroactive idea. It has to be that,” says Nobel Prize-winning mathematical physicist Sir Roger Penrose, reflecting on a problem about the building blocks of reality that has dogged physics for ...

In the Valis experiment, the quantum device is a single bit on an IBM Eagle chip, and the large device is the microwave control system that connects the qubits to the real world. These usually allow ...