Quantum, Quantum Computing, Algebra, Logic Gates.
state of the qubit is |1⟩ as expected. We can think of this as a rotation by π radians around the x-axis of the Bloch sphere. Similarly to the classical NOT gate, the X-gate changes the state from |0> to |1> (vice versa), that’s why it is also often called a NOT-gate. The Pauli Y & Z-gates The Y &