These two small-cap stocks look poised for gains over the next three years.

Quantum computing stocks have soared over the last year as investors' hopes have mounted that it will be the next big transformative technology.

The momentum began last December, when Alphabet unveiled its Willow quantum chip, which it said could do a calculation in less than five minutes that would have taken a traditional supercomputer 10 septillion years. This year, quantum computing stocks have moved higher, as the technology has been endorsed by the likes of Nvidia CEO Jensen Huang, and some pure-play quantum computing stocks seem to be delivering real progress, and as the artificial intelligence (AI) boom has primed demand for the next big technology breakthrough.

Of the four pure-play quantum comp

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