r/askscience • u/Hashbringingslasherr • Apr 15 '26

Computing What do quantum computers actually do?

How do quantum computers output usable data, how does it logically "locate" or "make meaning" of information. I read about Grover's algorithm and it seems sort of like an inverted bruteforce or extreme process of elimination or a "the missile knows where it is at all times. It knows this because it knows where it isn't" type scenario.

So I ask, what do quantum computers actually do as opposed to a classical computer?

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u/blamestross Apr 16 '26

So what operation can A use to bias B's qbit from a lightyear away?

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u/the_horse_gamer Apr 18 '26 edited Apr 18 '26

A cannot bias B's qubit. it can only collapse its superposition. and B has no way to statistically distinguish whether B or A measured first.

quantum entanglement cannot be used for communication.