Quantum computers still can’t deliver on any practical task without massive classical overhead eating the gains.
The basic idea of superposition lets a qubit explore multiple states at once, yet any attempt to map that advantage across platforms immediately runs into how quickly the states decohere. I tried sketching a simple search routine on paper using both superconducting and photonic descriptions side by side, and the extra steps needed to protect the information wiped out the theoretical edge in both cases.