Measuring the deviation from the superposition principle in interference experiments

Understand

The Feynman Path Integral formalism has long been used for calculations of probability amplitudes.

• Over the last few years, it has been extensively used to theoretically demonstrate that the usual application of the superposition principle in slit based interference experiments is often incorrect.
• This has caveat in both optics and quantum mechanics where it is often naively assumed that the boundary condition represented by slits opened individually is same as them being opened together.
• The correction term comes from exotic sub leading terms in the Path Integral which can be described by what are popularly called non-classical paths.