Is quantum computing two years from being useful, or twenty?

[Merchant27]

Until someone actually runs the specific calculation that matters to you, quantum computing exists in a genuinely dual state, it's a practical tool arriving within a couple of years for narrow chemistry and optimization problems, and it's still a research-stage technology two decades from anything most people would call useful

Both framings are defensible right now depending entirely on which recent headline you last read, a verified quantum advantage demo pushes you one way, a sober paper about persistent error rates pushes you the other. Nobody's lying, the field genuinely sits in both states depending on where you're standing

Pick your timeline, defend it, no hedging allowed. Two years or twenty

[Grace]

Genuinely hoping to be wrong about how far off this still is

[Amber Tiger]

IBM's own roadmap has an actual date on it now, so I'm siding with the shorter timeline

[Cameron47]

Two years, narrowly, for a handful of genuinely useful chemistry and optimization problems

[MJF_Fan]

Split down the middle, useful for some fields sooner and others meaningfully later

[Quiet Depot]

Finance and pharma get it soonest, everyone else waits considerably longer than that

[UltimateWarrior]

Neither number matters as much as who's actually paying to find out first

[DarkSideRichard47]

Every verified advantage demo so far has been narrow enough that the longer estimate feels honest

[Seb93]

Twenty, easily, useful for absolutely everyone is a completely different bar than useful for a lab