Summary: Quantum Measurements

Here are the key takeaways:

• Quantum measurement is different from classical measurement because it does not generally yield a deterministic result. If we measure the velocity of identically prepared classical (non-quantum) objects, we will get the same value each time, within experimental uncertainty. If we measure identically prepared quantum objects described by a superposition state, the outcomes vary randomly from one observation to the next. We will not get the same answer each time, regardless of experimental uncertainty.