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cirq.testing.random_density_matrix

Returns a random density matrix distributed with Hilbert-Schmidt measure.

cirq.testing.random_density_matrix(
    dim: int, *, random_state: 'cirq.RANDOM_STATE_OR_SEED_LIKE' = None
) -> np.ndarray

dim The width and height of the matrix.
random_state A seed to use for random number generation.

The sampled density matrix.

Reference:

'Random Bures mixed states and the distribution of their purity' https://arxiv.org/abs/0909.5094