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Atoms swap spins Physicists in the US have devised a way to swap the spin states of pairs of ultracold rubidium atoms in an optical lattice. The ability to switch individual spin states back and forth is an important first step towards a "half-SWAP" gate, which is an essential component of a quantum computer (Nature 448 452). Optical lattices use criss-crossing laser beams to create a matrix of potential wells that can each trap one or more atoms.
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