Technology update
Aug 30, 2007
Plans for single-photon transistor unveiled
It is challenging to make all-optical devices in which one light signal controls another because photons do not interact with each other very often. Now, researchers at Harvard University in the US and the Niels Bohr Institute in Denmark have put forward a novel approach to producing strong non-linear interactions between single photons by exploiting the coupling between individual optical emitters and surface plasmons on a conducting nanowire. The system acts as a non-linear two-photon switch for incoming photons travelling along the nanowire and could be used to create a single-photon transistor – one of the holy grails of quantum optical physicists.
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