In physics, the supersymmetric WKB (SWKB) approximation is an extension of the WKB approximation that uses principles from supersymmetric quantum mechanics to provide estimations on energy eigenvalues in quantum-mechanical systems. Using the supersymmetric method, there are potentials that can be expressed in terms of a superpotential, , such that The SWKB approximation then writes the Born–Sommerfeld quantization condition from the WKB approximation in terms of . The SWKB approximation for unbroken supersymmetry, to first order in is given by