Putting Qubits in Blended States

The Hadamard (H) gate puts qubits in blended states of images/_pragprog/svg-17.png and images/_pragprog/svg-18.png. It’s the signature gate of quantum computing and forms the bedrock of quantum programs. For me, it was one of the two quantum gates that brought home the terrific potential of quantum computing. (The other is the Pauli-Z gate, which we’ll cover in Chapter 5, Beam Me Up, Scotty—Quantum Tagging and Entangling .)

The H gate is fundamentally a qubelet splitter, which is the basic mechanism to create blended qubits. For example, it takes a qubit, which ...

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