14 min•Beginner
Quantum gates
Gates are the verbs of quantum computing — they transform qubit states in predictable ways.
Learning objectives
- Recognize X, Y, Z, H, S, T gates.
- Predict simple gate effects.
Pauli gates
X flips |0⟩↔|1⟩ (quantum NOT). Y and Z apply related rotations.
Phase gates
S and T add controlled phase — invisible on probabilities alone, but crucial for interference.
Superposition gate
H creates and undoes equal superpositions.
Key terms
Pauli-X
Quantum bit flip.
Phase
The complex angle of an amplitude.
Checkpoint
Which gate flips |0⟩ to |1⟩?