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Monday 2 December 2013

How Losing Information Can Benefit Quantum Computing

Suggesting that quantum computers might benefit from losing some data, physicists at the National Institute of Standards and Technology (NIST) have entangled—linked the quantum properties of—two ions by leaking judiciously chosen information to the environment.
 
Researchers usually strive to perfectly shield ions (charged atoms) in quantum computing experiments from the outside world. Any "noise" or interference, including heat generated by the experiment and measurements that cause fragile quantum states to collapse, can ruin data and prevent reliable logic operations, the conventional approach to quantum information processing.

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This is an artist's conception of a NIST experiment showing how quantum computing might benefit from lost information. Two beryllium ions (red), used as quantum bits or qubits to store information, were "entangled" so that their properties were linked -- a useful feature for quantum computing. Two partner magnesium ions (green) released heat to the environment. Any unwanted information in the qubits was coupled to the outgoing heat, leaving the qubits in the desired entangled state (suggested by the hourglass). Credit: Bertram/Motion Forge for NIST
 

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