hadamard gate
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Hadamard, S and T on the Bloch Sphere
The Hadamard gate is a half-turn about a diagonal axis, and S and T are partial twists about the vertical one. Seen on a live Bloch sphere, the H, S and T gates stop being matrices and start being furniture-moving.
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Quantum Gates: Hadamard, Pauli, CNOT, Toffoli (with Diagrams)
What each quantum gate actually does to a qubit state, with circuit diagrams and matrix forms for Hadamard, Pauli-X/Y/Z, CNOT, Toffoli, and the rotation gates.