Logic Gates

Physically, it is a device which performs a fixed Unitary operation on a selected set of qubits in a fixed period of time. Mathematically, a quantum gate is a Unitary operator

1 qubit gates

Circuit Hadamard gate Quantum Fourier Transform X-gate Z-gate Phase gate S-gate T-gate Pauli Matrices

2 qubit gates

CNOT-gate Controlled unitary gate