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Ions trapped on a chip By encoding information in the quantum states of subatomic particles, quantum computers have the potential to make the latest Pentium chip look as outmoded as the abacus. But before such a device can even begin to compete with its classical counterpart, we need to first find a way to scale-up individual quantum "bits". Now, physicists in the US have made an important step towards this goal by creating an ion trap on a semiconductor chip.
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