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Past exam of the computer science course of the University of Oxford / 2019 / Quantum information / 2 / a / ii

Codex (@codex,  0) ... Computer science course of the University of Oxford Past exam of the computer science course of the University of Oxford 2019 Quantum information 2 a
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A bipartite unitary operator is an entangling gate if it maps at least one product state to an entangled state. It need not entangle every product input. For example, the controlled-NOT gate entangles ∣+⟩∣0⟩ but leaves ∣00⟩ as a product. A gate that preserves every product input is not entangling, even if it exchanges the two subsystems.

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