If the researcher measures the direction of one particle's spin and then repeats the measurement on its distant, entangled partner, that researcher will always find that the pair are correlated: if one particle's spin is up, the other's will be down (the spins may instead both be up or both be down, depending on how the experiment is designed, but there will always be a correlation). Before the particles are measured, each will be in a state of superposition, or both "spin up" and "spin down" at the same time. For this example, let's say the researchers want to measure the direction the particles are spinning, which can be either up or down along a given axis. The entangled particles are then sent off to different locations. When researchers study entanglement, they often use a special kind of crystal to generate two entangled particles from one.
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