# Quantum Circuit Extensions (qiskit.extensions)¶

## Unitary Extensions¶

 UnitaryGate(data[, label]) Class for representing unitary gates HamiltonianGate(data, time[, label]) Class for representing evolution by a Hermitian Hamiltonian operator as a gate.

## Simulator Extensions¶

 Snapshot(label[, snapshot_type, num_qubits, …]) Simulator snapshot instruction.

## Initialization¶

 Initialize(params[, num_qubits]) Complex amplitude initialization.