Superposition is when something is existing simultaneously as more than one thing. Let’s take a simple practical example to demonstrate superposition. If we switched the light off and shot a bullet at a target, we do not know if the bullet hit the target or missed. In the darkness, we say the bullet is in a state of superposition, because it neither has hit the target nor missed. It has simultaneously hit and also missed the target. It is in no definite state, and will remain in this superposition until we switch on the light. When we switch on the light, we break the superposition and the bullet has either hit or missed the target. We have forced it to become one classical state whereas in the darkness (when it couldn’t be ‘measured’) it existed in a quantum superposition state. Superposition is imperative in the field of quantum computing.
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