Duality and helicity: the photon wave function approach

The Photon Wave Function

X Photon Wave Function

On the Wave Function of the Photon

Self-duality, Helicity and Background Field Loopology

I show that helicity plays an important role in the development of rules for computing higher loop effective Lagrangians. Specifically, the two-loop Heisenberg-Euler effective Lagrangian in quantum electrodynamics is remarkably simple when the background field has definite helicity (i.e., is self-dual). Furthermore, the twoloop answer can be derived essentially algebraically, and is naturally e...

Testing Wave-Particle Duality with Single-Photon Interference Measurements

We have observed wave and particle characteristics of light in two distinct experiments. In the first case, a strongly attenuated HeNe laser was passed through a Mach-Zender interferometer. The two legs of the interferometer were given definite, mutually perpendicular polarization to provide which-way information. The resulting interference pattern was captured using a wicked expensive Electron...