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Prototype promises practical quantum crypto

   September 1/8, 2008
Bring together two single photons emitted by two tiny clouds of atoms and you have the basic component of a quantum repeater. Quantum repeaters are needed to extend the distances quantum communications can span, which would make quantum cryptography practical.

The prototype repeater combines the ability to store and forward light with the ability to swap entanglement between two photons, two key requirements for boosting quantum communications signals that otherwise fade with distance.

Quantum cryptography promises nearly uncrackable security for messages.

Research paper:
Experimental Demonstration of a BDCZ Quantum Repeater Node
Nature, August 28, 2008

Researchers' homepages:
Quantum Optics and Quantum Information, University of Heidelberg
Jörg Schmiedmayer

Related stories and briefs:
Quantum connection -- a previous prototype quantum repeater


Back to TRN September 1/8, 2008

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