| gptkbp:instanceOf | gptkb:Quantum_state 
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                                | gptkbp:alsoKnownAs | gptkb:EPR_pairs 
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                                | gptkbp:basisFor | Maximally entangled two-qubit states 
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                                | gptkbp:containsElement | gptkb:Two-qubit_Hilbert_space 
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                                | gptkbp:example | |Φ+⟩ = (|00⟩ + |11⟩)/√2 |Φ−⟩ = (|00⟩ − |11⟩)/√2
 |Ψ+⟩ = (|01⟩ + |10⟩)/√2
 |Ψ−⟩ = (|01⟩ − |10⟩)/√2
 
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                                | gptkbp:firstDescribed | gptkb:John_S._Bell 1964
 
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                                | gptkbp:mathematicalRepresentation | Linear combinations of computational basis states 
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                                | gptkbp:namedAfter | gptkb:John_S._Bell 
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                                | gptkbp:property | Form a complete basis for two-qubit systems Maximally entangled
 Orthogonal
 
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                                | gptkbp:relatedTo | gptkb:EPR_paradox gptkb:Bell's_theorem
 gptkb:Quantum_nonlocality
 
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                                | gptkbp:state | 4 
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                                | gptkbp:usedFor | gptkb:Entanglement_swapping gptkb:Quantum_dense_coding
 gptkb:Quantum_error_correction
 Testing local realism
 
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                                | gptkbp:usedIn | gptkb:Quantum_information_theory gptkb:Quantum_teleportation
 Quantum cryptography
 Quantum entanglement experiments
 
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                                | gptkbp:bfsParent | gptkb:quantum_information_theory 
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                                | gptkbp:bfsLayer | 5 
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                                | https://www.w3.org/2000/01/rdf-schema#label | Bell states 
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