Source of photons with correlated polarisations and correlated directions

Yves Ménesguen, Jean-Loup Smirr, Pillet, Gérard +4 more

John Rarity, P. R. Tapster

Alan J. Duncan

This chapter presents an account of work carried out on metastable atomic hydrogen to measure the polarisation correlation of the two photons produced in the decay process and to test Bell’s inequality and ideas of enhancement. It describes the theory of the two-photon decay will be discussed and an appropriate form of Bell’s inequality. Experiments to test Bell’s inequality usually involve placing a linear polariser and detector diametrically on each side of a source. The measurements of the circular polarisation correlation were not in a form suitable to test Bell’s inequality directly and indicated that the imperfections of the nominally achromatic quarter-wave plates were such as to render unlikely a successful test along these lines. Measurements of the linear and circular polarisation have been carried out and Bell’s inequality put to the test.

Eoin Murray, G. Juška, E. Pelucchi

Abstract This paper provides a theoretical background for the simulations of particular quantum optics experiments, namely, photon intensity correlation measurements. A practical example, adapted to polarisation-entangled photon pairs emitted from a quantum dot, is presented. The tool, a virtual Hanbury Brown and Twiss correlator, simulates polarisation-resolved the second-order correlation functions, which then can be used in a photonic state tomography procedure—a full description of a light source’s polarisation state. This educational tool is meant to improve general understanding of such quantum optics experiments.

Augusto Garuccio

S M Khalid, Hans Kleinpoppen

A theory of electron-photon angular correlations using polarised electrons and polarised light atoms is presented. Its usefulness is illustrated by determining a complete set of scattering amplitudes for magnetic sublevels referring to direct and exchange excitation for the transition 2 S to 2 P in light one-electron atoms.