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IPFS News Link • Technology: Software

"Quantum data bus" can relocate quantum information

• http://www.gizmag.com, Richard Moss

This is a fundamental part of normal microprocessor operation; it involves the routing of information from one location to another. An international team of researchers has successfully trialled a "quantum data bus" that does just that, however, thanks to a technique called perfect state transfer.

The technique, which has been theorized for years but only now proven experimentally, involves moving one qubit, encoded in a single particle of light, to a (relatively) distant location without losing any quantum information. The researchers accomplished this with a one-dimensional lattice that they made from a series of 11 structures called waveguides. These are hollow tubes that they coupled together by injecting horizontally and vertically polarized laser light. The effect is akin to an optimized quantum tunneling.

They were able to transfer quantum information – preserving the encoded quantum state as the photonic qubit moved – across this array with an average fidelity of 97.1 percent.


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