Scientist Achieve Full Power Dense Coding With Superdense Photons [View All]

[Ordr]

Source: DailyTech

Kwiat's team took advantage of a more complicated form of entanglement known as hyperentanglement. By hyperentangling photons, the team is able to cause the photons to become entangled in more ways than one, allowing for the full transmission of data and achievement of 2 bits sent per photon.

The achievement of superdense, 2 bit coding carried out by Kwiat, graduate student Julio Barreiro, and postdoctoral researcher Tzu-Chieh Wei (now at the University of Waterloo) described the results in a paper, which has been accepted for publication in the Nature Physics journal.

The new superdense coding relies on conveying both photon's "wiggle" polarization, and its "twisting", its orbital angular momentum. In order to do this, spontaneous parametric down conversion is performed on a pair of nonlinear crystals, creating this phenomenon of dual-parameter hyperentanglement. Data is then transferred from one photon to the other by changing the polarization by applying birefringent phase shifts utilizing liquid crystals.

Read more: http://www.dailytech.com/Scientist+Achieve+Full+Power+Dense+Coding+With+Superdense+Photons/article11237.htm

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Somewhat headache inducing but fascinating nonetheless.