Physics:Quantum Bell state
A Bell state is a Book I topic in the Quantum Collection. Bell states are maximally entangled two-qubit states that form a convenient basis for describing correlations with no classical counterpart. Measurements on the two parts of a Bell state can violate Bell inequalities, showing that quantum theory cannot be explained by simple local hidden-variable models. Bell states are also practical resources in quantum information. They appear in teleportation, superdense coding, entanglement swapping, quantum repeaters, and tests of nonlocality. They make the abstract structure of entanglement concrete in the smallest composite quantum systems.
Overview
Placeholder: introduce Bell states as maximally entangled two-qubit states and explain why they are central in quantum information.
Key ideas
Placeholder: cover entanglement, two-qubit correlations, Bell basis, quantum teleportation, superdense coding.
Bell basis
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Correlations
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Preparation in circuits
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Uses in protocols
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See also
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