Photon wave function

TL;DR

This paper discusses the concept of the photon wave function, arguing that despite controversies, it can be useful if precisely defined, challenging the view that it does not exist.

Contribution

The paper advocates for a pragmatic definition of the photon wave function, countering claims of its non-existence due to property limitations.

Findings

Photon wave function can be useful with precise definition

Challenges to photon wave function are based on property limitations

Supports pragmatic approach over fundamentalist views

Abstract

Photon wave function is a controversial concept. Controversies stem from the fact that photon wave functions can not have all the properties of the Schroedinger wave functions of nonrelativistic wave mechanics. Insistence on those properties that, owing to peculiarities of photon dynamics, cannot be rendered, led some physicists to the extreme opinion that the photon wave function does not exist. I reject such a fundamentalist point of view in favor of a more pragmatic approach. In my view, the photon wave function exists as long as it can be precisely defined and made useful.