qiskit.quantum_info.random_density_matrix

random_density_matrix(dims, rank=None, method='Hilbert-Schmidt', seed=None)

Generator a random DensityMatrix.

Parameters

• dims (int or tuple) – the dimensions of the DensityMatrix.
• rank (int or None) – Optional, the rank of the density matrix. The default value is full-rank.
• method (string) – Optional. The method to use. ‘Hilbert-Schmidt’: (Default) sample from the Hilbert-Schmidt metric. ‘Bures’: sample from the Bures metric.
• seed (int or np.random.Generator) – Optional. Set a fixed seed or generator for RNG.

Returns

the random density matrix.

Return type

DensityMatrix

Raises

QiskitError – if the method is not valid.