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Ideally with the reference to the type of technology, when do experts predict a small universal quantum computer of a couple hundred qubits will be developed?

From my reading the leading techology is superconducting qubits, with spins in semiconductors being the next most likely. I've seen a handful of researches predict this being obtainable in 10 years, with others being less bullish.

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closed as primarily opinion-based by CuriousOne, DanielSank, John Rennie, AccidentalFourierTransform, gigacyan Apr 7 '16 at 6:41

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.