I'm not expecting quantum computers to actually do anything faster than conventional computers for many years, and that's fine; making things incrementally bett

I'm not expecting quantum computers to actually do anything faster than conventional computers for many years, and that's fine; making things incrementally better is usually much easier than making them work in the first place. People have been simulating quantum circuits as proof-of-concept for quantum algorithms, and D-Wave has a "quantum annealing" machine (although a preliminary glance suggests there's skepticism about whether that involves any provable quantum effect), and there are frequent reports about pushing the limits of entangled qubit count, but I'm wondering if anyone's actually made a quantum device that solves even a specific problem faster than non-quantum physics would allow (hence my original comment along those lines), rather than faster than conventional hardware (which could take years or decades to match).