From the course: Quantum Computing Fundamentals

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Pauli-Y gate

Pauli-Y gate

From the course: Quantum Computing Fundamentals

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Pauli-Y gate

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- Our next quantum logic gate is the Pauli-Y gate. And as its name suggests, it corresponds to a rotation of pie radiants or 180 degrees around the Y-axis of the Bloch sphere. You'll see it represented on our quantum circuit diagrams as a box with a letter Y in the middle. To use a Pauli-Y operator on this qubit, which is currently in the zero state, I'll put a finger on each side of the Y-axis and rotate it 80 degrees. As you can see that rotation changed our quantum state from zero to one. - Hang on a sec, that seems like what the Pauli-X gate did in a previous video. In fact, if I take my qubit starting in the zero state and then put my fingers along its X-axis and rotated it 180 degrees, I also end up with a qubit in the one state. So how are these two operations different? - Well, when applied to a qubit and one of our two standard basis states zero and one, which exists along the Z-axis, the Pauli-X and Pauli-Y…

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