Ivan Debono

A notebook of science, thoughts and reason

Day: June 25, 2012

The cheatproof exam

Triche au Bac : il faut concevoir des épreuves qui rendent le portable inutiles | Atlantico.

Vorticity in Venice

No technicolour here, but this is what it actually looks like.

‘Twisted light’ carries 2.5 terabits of data per second

Bo Thide of the Swedish Institute of Space Physics and a team of colleagues in Italy recently demonstrated the encoding of data using the orbital angular momentum of light, sending two beams made of different OAM states across a canal in Venice. Casanova would have been delighted.

Radio spectrum policy groups should be delighted too. The two beams were in fact incoherent radio waves, with the same frequency, but with different OAM states. With the airwaves getting crowded, this could be the next big thing.

I endorse this radio message


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