Realization of phase modulation using a spatial light modulator in the quantum Talbot configuration

TL;DR

This paper demonstrates the quantum Talbot effect using single photons and a programmable spatial light modulator, allowing easy variation of diffraction patterns and investigation of spectral bandwidth effects, supported by theoretical modeling.

Contribution

It introduces the use of a programmable spatial light modulator in quantum Talbot experiments, enabling flexible control of diffraction patterns and spectral bandwidth effects.

Findings

Diffraction patterns match theoretical predictions

Spectral bandwidth influences the diffraction pattern

Programmable SLM simplifies Talbot effect studies

Abstract

We demonstrate the quantum Talbot effect using pairs of single photons produced by parametric down conversion. In contrast to the previous works, we use a programmable spatial light modulator to behave as a diffraction grating. Thus, the investigation of the Talbot diffraction patterns under the variation of grating structure can be easily performed. The influence of spectral bandwidth of the down-converted photons on the diffraction pattern is also investigated. A theoretical model based on the wave nature of photons is presented to explain the Talbot diffraction pattern under varying conditions. The measured diffraction patterns are in good agreement with the theoretical prediction. We are convinced that our study improves the understanding of the quantum Talbot effect.