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Module to compute the second order Trotter error.
ceil(...): Return the ceiling of x as an Integral.
error_bound(...): Numerically upper bound the error in the ground state energy
error_operator(...): Determine the difference between the exact generator of unitary
sqrt(...): Return the square root of x.
trivially_double_commutes(...): Check if the double commutator [term_a, [term_b, term_c]] is zero.
trotter_steps_required(...): Determine the number of Trotter steps for accurate simulation.