ELI5: What is quantum supremacy

Quantum supremacy is when a quantum computer can solve a problem that no regular computer, even the biggest and fastest ones, could solve in a reasonable amount of time.

Imagine you have a really, really big puzzle with billions of pieces.

• A regular computer is like a person trying to solve this puzzle piece by piece, trying every possible combination until they find the right one. It would take them, like, forever!

• Now, imagine a quantum computer is like having a magic helper that can look at all the puzzle pieces at the same time and quickly figure out where they go.

• A regular computer would have to check each grain of sand, one by one, which would take a really long time.

• A quantum computer, using special tricks like quantum entanglement (imagine the grains of sand are magically connected), could somehow check all grains of sand simultaneously and find the right one much, much faster.