It seems that quantum computers can be classified by the type of quantum they operate on. Not entirely sure what category most common current systems fall into (eg. D-Wave, Google, IBM, Microsoft). Photonic computing seems to be one of the more 'popular' alternative methods. Curious about other forms of unconventional quantum computing.
Phonon - sound based
Roton - vortex based
Dropleton - quantum droplet*
Fracton - fractal analog of phonons*
Plasmon - plasma based
Have significant breakthroughs in quantum computing been made using non-standard quanta?