In quantum world, particles like photons can behave like particles (localized points) or waves (spreading out, showing interference patterns). The classic double-slit experiment is a good ...

How many beam splitters, lenses, and mirrors does it take to entangle a photon? The answer was “way too many” for years and that’s been the problem. In the quantum realm of photonics, pursuit of ...

The theoretical physicist John Wheeler once used the phrase “great smoky dragon” to describe a particle of light going from a source to a photon counter. “The mouth of the dragon is sharp, where it ...

A single atom as a movable slit: Researchers realize Einstein's thought experiment in original form, observing ...