Professor O'Brian states: "To get a useful computer it needs to be probably a million times more complex, so a full-scale useful factoring machine is still at least two decades away," he said. "But this is one important step in that direction."
Practical Quantum Computers Still Two Decades Away
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Sean Evans
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Practical Quantum Computers Still Two Decades Away
http://news.bbc.co.uk/2/hi/science/nature/8236943.stm