Qubits Are at the Heart of Quantum Computing. They're Also Its Greatest Weakness
Briefly

Entanglement is the other major quantum phenomenon enabling qubits to pass information to one another in a quantum computer.This is the idea that particles can be linked in such a way that they can't be described independently.Changing one particle by performing a measurement instantly changes its entangled partner, no matter how far apart the two particles are, even if they're on opposite ends of the universe.
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