# Фейнмановские суммы по путям в оптике

Простые и понятные вещи.

Feynman's Sum-over-Paths method applied in wave optics and for calculating the quantum probability current: https://arxiv.org/abs/2202.09232
Josef Joerg
Based on the Sum-over-Paths approach of Richard Feynman, an integration method for calculating wave phase vectors is derived. The diffraction and interference patterns of various slit masks can be calculated from such phase vectors. The results obtained match with those computed using the more complex Fresnel integrals. Babinet's principle for phases is presented for the first time. As an example, the diffraction pattern of a double slit can also be calculated by subtracting the phase vectors of a smaller slit from those of a larger one. This method is also demonstrated by using a diffraction calculation tool when an obstacle is positioned behind a double slit. The approach of phase vector integration is expanded to calculate the quantum probability current. Based on the Hamilton-Jacobi -- and the stationary Schrödinger -- equation, the quantum probability current is calculated and its continuity is shown. The time-dependent differential equation of the probabilty current velocity is numerically solved. For a large number of integrations it is statistically shown that the distribution of the flux per area is consistent with the probability density profile. This may raise the question of wether the probability density or the probability current distribution is measured by an interference experiment with particles. The quantum probability current is also simulated for photons traversing an asymmetrical double slit and the special results are discussed.
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