sf.utils.random_covariance

random_covariance(N, hbar=2, pure=False, block_diag=False)

Random covariance matrix.

Parameters

• N (int) – number of modes

• hbar (float) – the value of \(\hbar\) to use in the definition of the quadrature operators \(\x\) and \(\p\)

• pure (bool) – If True, a random covariance matrix corresponding to a pure state is returned.

• block_diag (bool) – If True, uses passive Gaussian transformations that are orthogonal instead of unitary. This implies that the positions \(q\) do not mix with the momenta \(p\) and thus the covariance matrix is block diagonal.

Returns

random \(2N\times 2N\) covariance matrix

Return type

array

code/api/strawberryfields.utils.random_covariance

 

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