pygsti.tools.optools.dmvec_to_state

dmvec_to_state(dmvec, tol=1e-06)

Compute the pure state describing the action of density matrix vector dmvec.

If dmvec represents a mixed state, ValueError is raised.

Parameters:

• dmvec (numpy array) – The vectorized density matrix, assumed to be in the standard (matrix unit) basis.

• tol (float, optional) – tolerance for determining whether an eigenvalue is zero.

Returns:

The pure state, as a column vector of shape = (N,1)

Return type:

numpy array