Quantum mechanics is full of weird phenomena, but perhaps none as weird as the role measurement plays in the theory. Since a measurement tends to destroy the “quantumness” of a system, it seems to be the mysterious link between the quantum and classical world.
Furthermore, when dealing with a vast system of quantum data units called “qubits,” the impact of measurements can lead to profoundly different outcomes, even driving the emergence of entirely new phases of quantum information.
This happens when two competing effects come to a head: interactions and measurement. In a quantum system, when the qubits interact with one another, their information becomes shared nonlocally in an “entangled state.”
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