x-gate
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X-gate
X-gate (or Pauli-X gate / Quantum NOT gate) is a quantum gate that serves as the quantum equivalent of logical NOT. Applying X to the qubit $\lvert 0\rangle$ yields $\lvert 1\rangle$, and applying X to the qubit $\lvert 1\rangle$ yields $\lvert 0\rangle$.
$$X = \begin{pmatrix}0 & 1\\1 & 0\end{pmatrix}$$
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