Not sure of the down vote here. I think that existing concepts such as ternary logic[1] prove the applicability of alternative (alternative to binary I mean),

Not sure of the down vote here. I think that existing concepts such as ternary logic[1] prove the applicability of alternative (alternative to binary I mean), multi-state computing models already. So, quantum processing is a different computing model and programming model, which up until recently has been too complicated to be in reach of the public, much like the Turing machine once was. I suspect with advances in cloud computing and programming tools like this Q# language, it will bring these advanced capabilities to a wider mass and then the techology's full potential can be more fully realized. I understand the parent's question, but perhaps an actual quantum computing scientist could answer here instead of me. [1] https://en.m.wikipedia.org/wiki/Three-valued_logic https://en.m.wikipedia.org/wiki/Three-valued_logic