Figure 4From: A stochastic evaluation of quantum Fisher information matrix with generic HamiltoniansThe classical Cramér-Rao bound in single-qubit Hamiltonian tomography. The results are plotted for two different approaches: Stoc.PSR (down triangle) and finite difference (up triangle). The standard quantum limit (SQL) and Heisenberg limit (HL) are shown for comparison. Here, SQL \(\propto 1/p\) and HL \(\propto 1/p^{2}\)Back to article page