qiskit_aer.library.save_density_matrix

save_density_matrix(self, qubits=None, label='density_matrix', unnormalized=False, pershot=False, conditional=False)

Save the current simulator quantum state as a density matrix.

Parameters

• qubits (list or None) – the qubits to save reduced density matrix on. If None the full density matrix of qubits will be saved [Default: None].
• label (str) – the key for retrieving saved data from results.
• unnormalized (bool) – If True return save the unnormalized accumulated or conditional accumulated density matrix over all shots [Default: False].
• pershot (bool) – if True save a list of density matrices for each shot of the simulation rather than the average over all shots [Default: False].
• conditional (bool) – if True save the average or pershot data conditional on the current classical register values [Default: False].

Returns

with attached instruction.

Return type

QuantumCircuit