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Physicists Find Way to Control Individual Bits in Quantum Computers

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Optical lattices use lasers to separate rubidium atoms (red) for use as information “bits” in neutral-atom quantum processors -- prototype devices which designers are trying to develop into full-fledged quantum computers. NIST scientists have managed to isolate and control pairs of the rubidium atoms with polarized light, an advance that may bring quantum computing a step closer to reality. Click for larger image.

Physicists at Commerce’s National Institute of Standards and Technology (NIST) have overcome a hurdle in quantum computer development, having devised a viable way to manipulate a single “bit” in a quantum processor without disturbing the information stored in its neighbors. The approach, which makes novel use of polarized light to create “effective” magnetic fields, could bring the long-sought computers a step closer to reality. A great challenge in creating a working quantum computer is maintaining control over the carriers of information, the “switches” in a quantum processor while isolating them from the environment. (More)

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