quantum advantage
The point where a quantum computer does a useful task better than any ordinary computer can.
Quantum computers are only worth using where they beat ordinary computers. Quantum advantage means showing that on a real task, not a test built to favour the quantum machine. Claims are often challenged when someone finds a faster ordinary method. For a business, the question is whether advantage exists for its own problem.
Think of it as
Like a new delivery route: it only matters once it is faster than every existing road, on the trips you actually make.
Example
A company is offered a quantum pilot for its logistics planning. Before paying, it asks whether anyone has shown the quantum method beating the best ordinary software on similar problems.