Single photon detected but not destroyed

First instrument built that can witness the passage of a light particle without absorbing it

By Andrew Grant, 13:53 PM November 7, 2013

Physicists have seen a single particle of light and then let it go on its way. The feat was possible thanks to a new technique that, for the first time, detects optical photons without destroying them. The technology could eventually offer perfect detection of photons, providing a boost to quantum communication and even biological imaging.

Plenty of commercially available instruments can identify individual light particles, but these instruments absorb the photons and use the energy to produce...

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