Entanglement
January 3, 2025
Entanglement appears when a multi-qubit state cannot be written as a tensor product of single-qubit states.
Bell state example
A canonical entangled state is
Measuring both qubits in the computational basis always yields either 00 or 11, with equal probability.
Entanglement is a resource for protocols such as superdense coding and quantum teleportation, and it plays a central role in many algorithms.
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Read about Measurement.