>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of David VanHorn
>Sent: 22 January 2007 17:50
>To: Microcontroller discussion list - Public.
>Subject: [OT] Image stored in a single photon?
>
>
>Could this be real?
>
>http://www.cbc.ca/technology/story/2007/01/22/photon-storage.html

As the article says, it sounds impossible.

(Just for context the 'UR' is a small pixelated image of the letters U and R for Rochester University)

"The UR was made by sending a single photon through a stencil with U and R etched out. The photon carried the shadow of the UR with it into a cell of cesium gas, where it was slowed and compressed, so many pulses could be held there at the same time."

I've almost certainly misunderstood this quote, but how can a mask possibly cause a single photon to cast a shadow?  A shadow is just the contrast between high and low light areas, so with a single photon how can the shape of this area be defined?

Regards

Mike

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