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Scientists take quantum leap to ultrafast communication system

Scientists believe that this phenomenon can be harnessed for quantum teleportation.

Written by Agencies | London |
August 12, 2012 2:49:11 pm

Scientists claim to have cracked the code to creating ultra fast communication systems operating at much faster speeds without the use of cables.

Chinese researchers were able to teleport a qubit (a standard unit of data in quantum computing) 97 kilometres across Qinghai Lake using a small set of photons without fibre-optic cables or other intermediaries,a new report said.’

They created entangled photons by stimulating a crystal with ultraviolet light,producing a pair of photons with the same wavelength,but opposite polarisation values.

Using these photons,the researchers copied the quantum state from the laboratory to the far station,achieving quantum teleportation over a much larger distance than the previous record of 16 kilometres.

The laser targeting device developed by Chinese scientist Juan Yin was necessary to counteract the minute seismic and atmosphere shifts that would otherwise break the link between the two remote locations.

A European and Canadian group claims to have teleported information from one of the Canary Islands to another,143 kilometres away. However,the paper has not been peer-reviewed or published.

Quantum teleportation relies on a phenomenon known as entanglement,through which quantum particles share a fragile,invisible link across space.

Two entangled photons,for instance,can have correlated,opposite polarisation states – if one photon is vertically polarised,for instance,the other must be horizontally polarised.

But,with the development of quantum mechanics,each photon’s specific polarisation remains undecided until one of them is measured.

At that instant the other photon’s polarisation snaps into its opposing orientation,even if many kilometres have come between the entangled pair.

Scientists believe that this phenomenon can be harnessed for quantum teleportation.

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