Optical-lattice clocks have pushed the limits of frequency measurement — to such an extent that a tiny difference in altitude affects the clock's tick rate, as Hidetoshi Katori elucidates.

The new measurement, based on just one month of data, cuts the possible upper limit of the neutrino mass in half, compared with the best previous estimate from a direct-measurement experiment.

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 non ...

Playing quantum tricks with measurements Date: February 17, 2013 Source: University of Innsbruck Summary: Physicists have performed an experiment that seems to contradict the foundations of ...

A Vermont research team has cracked a 90-year-old puzzle, creating a quantum version of the damped harmonic oscillator. By reformulating Lamb’s classical model, they showed how atomic vibrations can ...