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This is a tricky point, but I would say that D-Wave systems are quantum computers, however they rely on coherence, and not entanglement (coherence is necessary for entanglement, but you don't get entanglement automatically from coherence ), and thus do not have a universal set of quantum gates. D-wave systems thus can gain a quadratic advantage over classical systems, but will not see exponential speedups (likely need entanglement for this).

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