From Photonics.com: 

Light Changed to Matter, Then Stopped and Moved

CAMBRIDGE, Mass., Feb. 8, 2007 — By converting light into matter and then back again, physicists have for the first time stopped a light pulse and then restarted it a small distance away. This “quantum mechanical magic trick” provides unprecedented control over light and could have applications in fiber-optic communication and quantum information processing

In quantum networks, information optically transmitted over the network is converted into matter, processed, and then converted back into light. The physicists at Harvard University hope that their discovery could provide a possible way to do this, since matter, unlike light, can easily be manipulated. Their findings were published this week in the journal Nature.

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