Testing The Existence of Single Photons

TL;DR

This paper experimentally confirms the existence of single photons by demonstrating anti-correlation in laser output, significantly violating classical wave predictions and providing strong evidence for quantum behavior.

Contribution

The study provides experimental evidence for single photons using correlation measurements, surpassing classical limits by 80 standard deviations.

Findings

Anti-correlation parameter exceeds classical prediction by 80 standard deviations

Demonstrates the existence of single photons through correlation measurements

Violates classical wave behavior predictions for light

Abstract

We demonstrated the existence of single photon by counting correlation of laser output of a birefringent $\beta$-Barium Borate (BBO) crystal. The best result of anti-correlation parameter violates the classical prediction for wavelike behavior of light by 80 standard deviations.