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Imaging quantum entanglement
Date:9/24/2007

An international team including scientists from the London Centre for Nanotechnology (LCN) today publishes findings in the journal Proceedings of the National Academy of Sciences (PNAS) demonstrating the dramatic effects of quantum mechanics in a simple magnet. The importance of the work lies in establishing how a conventional tool of material science neutron beams produced at particle accelerators and nuclear reactors can be used to produce images of the ghostly entangled states of the quantum world.

At the nano scale, magnetism arises from atoms behaving like little magnets called spins. In ferromagnets the kind that stick to fridge doors all of these atomic magnets point in the same direction. In antiferromagnets, the spins were thought to spontaneously align themselves opposite to the adjacent spins, leaving the material magnetically neutral overall. The new research shows that this picture is not correct because it ignores the uncertainties of quantum mechanics. In particular, at odds with everyday intuition, the quantum-mechanical physical laws which operate on the nano-scale allow a spin to simultaneously point both up and down. At the same time, two spins can be linked such that even though it is impossible to know the direction of either by itself, they will always point in opposite directions in which case they are entangled.

With their discovery, the researchers demonstrate that neutrons can detect entanglement, the key resource for quantum computing.

One of the lead authors of the work, Professor Des McMorrow from the LCN, comments: When we embarked on this work, I think it is fair to say that none of us were expecting to see such gigantic effects produced by quantum entanglement in the material we were studying. We were following a hunch that this material might yield something important and we had the good sense to pursue it.

The researchers next steps will be to pursue the implications for high temperatu
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Contact: Dave Weston
d.weston@ucl.ac.uk
44-020-767-97678
University College London
Source:Eurekalert

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