Computational speedups using small quantum devices

07/24/2018

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by   Vedran Dunjko, et al.

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Suppose we have a small quantum computer with only M qubits. Can such a device genuinely speed up certain algorithms, even when the problem size is much larger than M? Here we answer this question to the affirmative. We present a hybrid quantum-classical algorithm to solve 3SAT problems involving n<<M variables that significantly speeds up its fully classical counterpart. This question may be relevant in view of the current quest to build small quantum computers.