Theoretical Analysis of Two-Color Ghost Interference

TL;DR

This paper provides a theoretical analysis of two-color ghost interference, predicting a nonlocal effect where fringe width depends on both photons' wavelengths, which can be experimentally tested.

Contribution

It introduces a theoretical prediction of a nonlocal wavelength-dependent effect in two-color ghost interference, expanding understanding of entangled photon behavior.

Findings

Fringe width depends on both photons' wavelengths.

The effect is nonlocal and arises from frequency differences.

Prediction can be tested with a modified experiment.

Abstract

Recently demonstrated ghost interference using correlated photons of different frequencies, has been theoretically analyzed. The calculation predicts an interesting nonlocal effect: the fringe width of the ghost interference depends not only on the wave-length of the photon involved, but also on the wavelength of the other photon with which it is entangled. This feature, arising because of different frequencies of the entangled photons, was hidden in the original ghost interference experiment. This prediction can be experimentally tested in a slightly modified version of the experiment.