pygsti.tools.matrixtools.expop_multiply_prep

expop_multiply_prep(op, a_1_norm=None, tol=1.1102230246251565e-16)

Returns “prepared” meta-info about operation op, which is assumed to be traceless (so no shift is needed).

Used as input for use with _custom_expm_multiply_simple_core or fast C-reps.

Parameters:

• op (scipy.sparse.linalg.LinearOperator) – The operator to exponentiate.

• a_1_norm (float, optional) – The 1-norm (if computed separately) of op.

• tol (float, optional) – Tolerance used to within matrix exponentiation routines.

Returns:

A tuple of values to pass to expm_multiply_fast.

Return type:

tuple