First silicon entanglement will aid quantum computing: John Morton of the University of Oxford and colleagues succeeded by using a half-millimetre-wide crystal of silicon studded with phosphorus atoms. Cooling this to a few degrees above absolute zero and applying a magnetic field aligned the spins of one phosphorus electron per atom.
They then applied two microwave pulses. One sent these electrons into a fuzzy quantum state, in which the spin of each electron had a 50-50 chance of being either up or down. The second forced the spin of each electron's nearest phosphorus nucleus to align with it, producing billions of pairs of entangled objects...
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