DOES quantum physics have no respect? Yet another law of classical physics – the diffraction limit – has been beaten by a trick that plays on the quantum properties of photons.
The principle of the diffraction limit means light cannot be used to see or inscribe features that are smaller than half its wavelength. This limits the density of data on a CD, for example, and the size of the circuits on microchips.
To get round this, physicists at the University of Toronto in Canada entangled three photons, a process which leaves them sharing the same quantum state. They then behave like…
