Quantum entanglement is one of the strangest aspects of "quantum strangeness". When two elementary particles are entangled, the outcome of the measurement of a specific property of one implies that the other will have a constrained value of the same measurement. For example, two electrons such that initially have opposite spins will be entangled relative to spin. That is, if one is measured spin up the other will have spin down. This lecture will start with a crash course in quantum mechanics. Entanglement will be put in mathematical terms. Then it will be shown how to use invariant theory to measure it.
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