No measurement can be simpler than the counting of ticks, making frequency — and hence time — the most accurately measurable quantity. To establish a reference tick rate, people have always been ...

This press release is available in German. A team of physicists at the University of Innsbruck, Austria, performed an experiment that seems to contradict the foundations of quantum theory -- at first ...

Miniscule, invisible neutrino particles are ubiquitous but nearly impossible to catch. They fly though the Earth—and us—every moment, by the billions. They are the smallest known matter particles in ...

Measurements on quantum systems have puzzled generations of physicists due to their counterintuitive properties. One of them is the fact that measurements on a quantum system are in general ...